dt-bindings: display: renesas,du: add top-level constraints

Properties with variable number of items per each device are expected to
have widest constraints in top-level "properties:" block and further
customized (narrowed) in "if:then:". Add missing top-level constraints
for clocks, clock-names, interrupts, resets, reset-names, renesas,cmms
and renesas,vsps.

Reviewed-by: Laurent Pinchart <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Tomi Valkeinen <[e-mail]>
Signed-off-by: Tomi Valkeinen <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

Documentation/devicetree/bindings/display/renesas,du.yaml

···
     maxItems: 1
 
   # See compatible-specific constraints below.
-  clocks: true
-  clock-names: true
+  clocks:
+    minItems: 1
+    maxItems: 8
+
+  clock-names:
+    minItems: 1
+    maxItems: 8
+
   interrupts:
+    minItems: 1
+    maxItems: 4
     description: Interrupt specifiers, one per DU channel
-  resets: true
-  reset-names: true
+
+  resets:
+    minItems: 1
+    maxItems: 2
+
+  reset-names:
+    minItems: 1
+    maxItems: 2
 
   power-domains:
     maxItems: 1
···
 
   renesas,cmms:
     $ref: /schemas/types.yaml#/definitions/phandle-array
-    minItems: 1
+    minItems: 2
     maxItems: 4
     items:
       maxItems: 1