dt-bindings: mtd: gpmi-nand: Add 'fsl,imx8qxp-gpmi-nand' compatible string

Add 'fsl,imx8qxp-gpmi-nand' compatible string and clock-names restriction.

Signed-off-by: Frank Li <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

Documentation/devicetree/bindings/mtd/gpmi-nand.yaml

···
           - fsl,imx6q-gpmi-nand
           - fsl,imx6sx-gpmi-nand
           - fsl,imx7d-gpmi-nand
+          - fsl,imx8qxp-gpmi-nand
       - items:
           - enum:
               - fsl,imx8mm-gpmi-nand
···
         clock-names:
           items:
             - const: gpmi_io
+            - const: gpmi_bch_apb
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx8qxp-gpmi-nand
+    then:
+      properties:
+        clocks:
+          items:
+            - description: SoC gpmi io clock
+            - description: SoC gpmi apb clock
+            - description: SoC gpmi bch clock
+            - description: SoC gpmi bch apb clock
+        clock-names:
+          items:
+            - const: gpmi_io
+            - const: gpmi_apb
+            - const: gpmi_bch
             - const: gpmi_bch_apb
 
 examples: