dt-bindings: HID: i2c-hid: elan: Introduce Elan ekth6a12nay

The Elan ekth6a12nay touch screen chip same as Elan eKTH6915 controller
has a reset gpio. The difference is that they have different
post_power_delay_ms.

Acked-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Zhaoxiong Lv <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: Zhaoxiong Lv

Documentation/devicetree/bindings/input/elan,ekth6915.yaml

@@ -23,7 +23,9 @@ properties:
           - enum:
               - elan,ekth5015m
           - const: elan,ekth6915
-      - const: elan,ekth6915
+      - enum:
+          - elan,ekth6915
+          - elan,ekth6a12nay
 
   reg:
     const: 0x10