dt-bindings: soc: fsl,imx-iomuxc-gpr: Document i.MX53

imx53.dtsi has the following compatible entry:

compatible = "fsl,imx53-iomuxc-gpr", "syscon";

Document the "fsl,imx53-iomuxc-gpr" entry to fix the following dt-schema warning:

failed to match any schema with compatible: ['fsl,imx53-iomuxc-gpr', 'syscon']

---
 .../devicetree/bindings/soc/imx/fsl,imx-iomuxc-gpr.yaml          | 1 +
 1 file changed, 1 insertion(+)

index 8451cb4dd87c..b77ce8c6a935 100644
@@ -38,6 +38,7 @@ properties:
           - const: simple-mfd
       - items:
           - enum:
+              - fsl,imx53-iomuxc-gpr
               - fsl,imx8mm-iomuxc-gpr
               - fsl,imx8mn-iomuxc-gpr
               - fsl,imx8mp-iomuxc-gpr

2.34.1

Applied, thanks!