drm/amd/display: Add missing SPDX license identifier

[Why]
All files should be properly classified.

[How]
Add missing SPDX-License-Identifier.

Reviewed-by: Sun peng (Leo) Li <sunpeng.li@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2015 Advanced Micro Devices, Inc.
  *
@@ -10395,6 +10396,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 #if defined(CONFIG_DRM_AMD_SECURE_DISPLAY)
 				if (amdgpu_dm_crc_window_is_activated(crtc)) {
 					uint8_t cnt;
+
 					spin_lock_irqsave(&adev_to_drm(adev)->event_lock, flags);
 					for (cnt = 0; cnt < MAX_CRC_WINDOW_NUM; cnt++) {
 						if (acrtc->dm_irq_params.window_param[cnt].enable) {

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright (C) 2015-2020 Advanced Micro Devices, Inc. All rights reserved.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2018 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2015 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crc.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2019 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2018 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2018 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2019 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2019 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2015 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2015 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2015 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_irq_params.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2020 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2012-15 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2012-15 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2018 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2021 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_psr.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2021 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_replay.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: MIT
 /*
  * Copyright 2023 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_replay.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: MIT */
 /*
  * Copyright 2021 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c

@@ -1,3 +1,4 @@
+//SPDX-License-Identifier: MIT
 /*
  * Copyright 2015 Advanced Micro Devices, Inc.
  *

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_trace.h

@@ -1,3 +1,4 @@
+//SPDX-License-Identifier: MIT
 /*
  * Copyright 2018 Advanced Micro Devices, Inc.
  *