dt-bindings: display: samsung,amoled-mipi-dsi: Do not require enable-gpios on samsung,s6e63j0x03

The samsung,s6e63j0x03 does not have enable GPIO, so do not require it.
This fixes dtbs_check warning:

  arch/arm/boot/dts/exynos3250-rinato.dt.yaml: panel@0: 'enable-gpios' is a required property

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200829172532.29358-1-krzk@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/display/panel/samsung,amoled-mipi-dsi.yaml

@@ -12,6 +12,17 @@ maintainers:
 allOf:
   - $ref: panel-common.yaml#
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - samsung,s6e3ha2
+              - samsung,s6e3hf2
+    then:
+      required:
+        - enable-gpios
+
 properties:
   compatible:
     enum:
@@ -39,7 +50,6 @@ required:
   - vdd3-supply
   - vci-supply
   - reset-gpios
-  - enable-gpios
 
 additionalProperties: false