media: dt-bindings: imx258: Fix alternate compatible strings

Multiple compatible strings must appear as an enum.

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

Documentation/devicetree/bindings/media/i2c/imx258.yaml

@@ -19,8 +19,9 @@ description: |-
 
 properties:
   compatible:
-    const: sony,imx258
-    const: sony,imx258-pdaf
+    enum:
+      - sony,imx258
+      - sony,imx258-pdaf
 
   assigned-clocks: true
   assigned-clock-parents: true