dt-bindings: leds: Update devicetree documents for ID_RGB

Update the leds/common.yaml to indicate that the max color ID is 9.
Reflect the same change in the leds-class-multicolor.yaml
Reported-by: NZhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: NDan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20201016115703.30184-1-dmurphy@ti.comSigned-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/leds/common.yaml

@@ -43,7 +43,7 @@ properties:
       LED_COLOR_ID available, add a new one.
     $ref: /schemas/types.yaml#definitions/uint32
     minimum: 0
-    maximum: 8
+    maximum: 9
 
   function-enumerator:
     description:

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

@@ -16,7 +16,7 @@ description: |
   modules. This is achieved by adding multi-led nodes layer to the
   monochrome LED bindings.
   The nodes and properties defined in this document are unique to the multicolor
-  LED class.  Common LED nodes and properties are inherited from the common.txt
+  LED class.  Common LED nodes and properties are inherited from the common.yaml
   within this documentation directory.
 
 patternProperties:
@@ -25,10 +25,11 @@ patternProperties:
     description: Represents the LEDs that are to be grouped.
     properties:
       color:
-        const: 8  # LED_COLOR_ID_MULTI
         description: |
-          For multicolor LED support this property should be defined as
-          LED_COLOR_ID_MULTI which can be found in include/linux/leds/common.h.
+          For multicolor LED support this property should be defined as either
+          LED_COLOR_ID_RGB or LED_COLOR_ID_MULTI which can be found in
+          include/linux/leds/common.h.
+        enum: [ 8, 9 ]
 
     $ref: "common.yaml#"