dt-bindings: input: mediatek,pmic-keys: Fix typo in "linux,keycodes" property name

"linux-keycodes" is the wrong property name and is unused. It should be
"linux,keycodes" instead.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230613201040.2823802-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/input/mediatek,pmic-keys.yaml

@@ -55,7 +55,7 @@ patternProperties:
 
       interrupt-names: true
 
-      linux-keycodes:
+      linux,keycodes:
         maxItems: 1
 
       wakeup-source: true