dt-bindings: soc: imx: fsl,imx-iomuxc-gpr: add imx6

Add compatibles used by different i.MX6 variants to the i.MX IOMUX
Controller GPR binding.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Link: https://lore.kernel.org/r/20240226212740.2019837-5-sre@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml

@@ -17,7 +17,23 @@ properties:
   compatible:
     oneOf:
       - items:
-          - const: fsl,imx8mq-iomuxc-gpr
+          - enum:
+              - fsl,imx6q-iomuxc-gpr
+              - fsl,imx8mq-iomuxc-gpr
+          - const: syscon
+          - const: simple-mfd
+      - items:
+          - enum:
+              - fsl,imx6sl-iomuxc-gpr
+              - fsl,imx6sll-iomuxc-gpr
+              - fsl,imx6ul-iomuxc-gpr
+          - const: fsl,imx6q-iomuxc-gpr
+          - const: syscon
+      - items:
+          - enum:
+              - fsl,imx6sx-iomuxc-gpr
+              - fsl,imx7d-iomuxc-gpr
+          - const: fsl,imx6q-iomuxc-gpr
           - const: syscon
           - const: simple-mfd
       - items: