dt-bindings: gpu: mali-bifrost: Add sub-schema for MT8192's power domains

MediaTek MT8192 (and similar) needs five power domains for the
Mali GPU and no sram-supply: change the binding to allow so by
also introducing power-domain-names in the generic binding;
while at it, also disallow the newly introduced power-domain-names
for all non-MediaTek bindings.

Fixes: 5d82e74a97 ("dt-bindings: Add compatible for Mali Valhall (JM)")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230316102041.210269-5-angelogioacchino.delregno@collabora.com

Documentation/devicetree/bindings/gpu/arm,mali-bifrost.yaml

@@ -177,6 +177,25 @@ allOf:
     else:
       properties:
         sram-supply: false
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt8192-mali
+    then:
+      properties:
+        power-domains:
+          minItems: 5
+        power-domain-names:
+          items:
+            - const: core0
+            - const: core1
+            - const: core2
+            - const: core3
+            - const: core4
+      required:
+        - power-domains
+        - power-domain-names
   - if:
       properties:
         compatible: