media: dt-bindings: mediatek,vcodec-encoder: Drop assigned-clock properties

The assigned-clock properties are always allowed on nodes with
'clocks' and generally not required. Additionally the mt8183 doesn't
define them, so they must not be required in that case.

Signed-off-by: "Rob Herring (Arm)" <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring (Arm) <[e-mail]>

Documentation/devicetree/bindings/media/mediatek,vcodec-encoder.yaml

···
     minItems: 1
     maxItems: 5
 
-  assigned-clocks: true
-
-  assigned-clock-parents: true
-
   iommus:
     minItems: 1
     maxItems: 32
···
   - clocks
   - clock-names
   - iommus
-  - assigned-clocks
-  - assigned-clock-parents
 
 allOf:
   - if: