dt-bindings: leds: Unify 'leds' property

A number of existing schemas use 'leds' property to provide
phandle-array of LED(s) to the consumer. Additionally, with the
upcoming privacy-led support in device-tree, v4l2 subnode could be a
LED consumer, meaning that all camera sensors should support 'leds'
and 'led-names' property via common 'video-interface-devices.yaml'.

To avoid duplication, unify 'leds' property from existing schemas
to newly introduced 'led-consumer.yaml'.

Signed-off-by: Aleksandrs Vinarskis <alex@vinarskis.com>
Reviewed-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://lore.kernel.org/r/20250910-leds-v5-2-bb90a0f897d5@vinarskis.com
Signed-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/leds/backlight/led-backlight.yaml

@@ -23,11 +23,7 @@ properties:
   compatible:
     const: led-backlight
 
-  leds:
-    description: A list of LED nodes
-    $ref: /schemas/types.yaml#/definitions/phandle-array
-    items:
-      maxItems: 1
+  leds: true
 
 required:
   - compatible

Documentation/devicetree/bindings/leds/leds-group-multicolor.yaml

@@ -17,10 +17,7 @@ properties:
   compatible:
     const: leds-group-multicolor
 
-  leds:
-    description:
-      An aray of monochromatic leds
-    $ref: /schemas/types.yaml#/definitions/phandle-array
+  leds: true
 
 required:
   - leds

Documentation/devicetree/bindings/media/video-interface-devices.yaml

@@ -17,6 +17,14 @@ properties:
       An array of phandles, each referring to a flash LED, a sub-node of the LED
       driver device node.
 
+  leds:
+    minItems: 1
+    maxItems: 1
+
+  led-names:
+    enum:
+      - privacy
+
   lens-focus:
     $ref: /schemas/types.yaml#/definitions/phandle
     description: