dt-bindings: leds: nxp,pca963x: Fix reg maximum for pca9635

The pca9635 supports 16 LED channels, unlike the pca9634 which only
supports 8. The allOf conditional grouped both chips under a single
else branch capping reg at a maximum of 7.

Give pca9634 its own if/then block and set maximum: 15 unconditionally
in the top-level led@ node, making it the default for pca9635 and any
future compatible. Also tighten the node name regex from [0-9a-f]+ to
[0-9a-f] to match the single-digit hardware limit.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Link: https://patch.msgid.link/20260727-monza-leds-v8-1-6e7e93d44dba@oss.qualcomm.com
Signed-off-by: Lee Jones <lee@kernel.org>

Documentation/devicetree/bindings/leds/nxp,pca963x.yaml

@@ -62,14 +62,14 @@ properties:
       open-drain, newer chips to totem pole).
 
 patternProperties:
-  "^led@[0-9a-f]+$":
+  "^led@[0-9a-f]$":
     type: object
     $ref: common.yaml#
     unevaluatedProperties: false
 
     properties:
       reg:
-        minimum: 0
+        maximum: 15
 
     required:
       - reg
@@ -88,7 +88,13 @@ allOf:
           properties:
             reg:
               maximum: 3
-    else:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nxp,pca9634
+    then:
       patternProperties:
         "^led@[0-9a-f]+$":
           properties: