dt-bindings: leds: qcom-wled: fix number of addresses

On PM660L, PMI8994 and PMI8998, the WLED has two address spaces.  This
also fixes dtbs_check warnings like:

  arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dtb: leds@d800: reg: [[55296], [55552]] is too long

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220825125410.232377-3-krzysztof.kozlowski@linaro.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/leds/backlight/qcom-wled.yaml

@@ -26,7 +26,8 @@ properties:
       - qcom,pm8150l-wled
 
   reg:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
   default-brightness:
     description: |
@@ -171,6 +172,9 @@ allOf:
 
     then:
       properties:
+        reg:
+          maxItems: 1
+
         qcom,current-boost-limit:
           enum: [ 105, 385, 525, 805, 980, 1260, 1400, 1680 ]
           default: 805
@@ -189,6 +193,9 @@ allOf:
 
     else:
       properties:
+        reg:
+          minItems: 2
+
         qcom,current-boost-limit:
           enum: [ 105, 280, 450, 620, 970, 1150, 1300, 1500 ]
           default: 970