drm: move i915_gsc_proxy_mei_interface.h under include/drm/intel

Clean up the top level include/drm directory by grouping all the Intel
specific files under a common subdirectory.

Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Airlie <airlied@gmail.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/461662d528c3f327c81b764b7c883cd4519d8729.1717075103.git.jani.nikula@intel.com

drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c

@@ -6,7 +6,7 @@
 #include <linux/component.h>
 
 #include <drm/i915_component.h>
-#include <drm/i915_gsc_proxy_mei_interface.h>
+#include <drm/intel/i915_gsc_proxy_mei_interface.h>
 
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_print.h"

drivers/gpu/drm/xe/xe_gsc_proxy.c

@@ -10,7 +10,7 @@
 
 #include <drm/drm_managed.h>
 #include <drm/i915_component.h>
-#include <drm/i915_gsc_proxy_mei_interface.h>
+#include <drm/intel/i915_gsc_proxy_mei_interface.h>
 
 #include "abi/gsc_proxy_commands_abi.h"
 #include "regs/xe_gsc_regs.h"

drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c

@@ -18,7 +18,7 @@
 #include <linux/uuid.h>
 #include <drm/drm_connector.h>
 #include <drm/i915_component.h>
-#include <drm/i915_gsc_proxy_mei_interface.h>
+#include <drm/intel/i915_gsc_proxy_mei_interface.h>
 
 /**
  * mei_gsc_proxy_send - Sends a proxy message to ME FW.