dts: Add bindings for ft5336 touch panel controller

Adds device tree bindings for the focaltech ft5336 touch panel
controller, which will be used on several i.mx rt evk boards.

Moves address-cells and size-cells properties from the base kscan
bindings to the specific microchip,xec bindings since they are not
required for the ft5336.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>

dts/bindings/kscan/focaltech,ft5336.yaml

@@ -0,0 +1,13 @@
+# Copyright (c) 2020 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+description: FT5336 capacitive touch panel
+
+compatible: "focaltech,ft5336"
+
+include: [kscan.yaml, i2c-device.yaml]
+
+properties:
+    int-gpios:
+      type: phandle-array
+      required: false

dts/bindings/kscan/kscan.yaml

@@ -8,11 +8,5 @@ include: base.yaml
 bus: kscan
 
 properties:
-    "#address-cells":
-      required: true
-      const: 1
-    "#size-cells":
-      type: int
-      const: 0
     label:
       required: true

dts/bindings/kscan/microchip,xec-kscan.yaml

@@ -8,6 +8,12 @@ compatible: "microchip,xec-kscan"
 include: kscan.yaml
 
 properties:
+    "#address-cells":
+      required: true
+      const: 1
+    "#size-cells":
+      type: int
+      const: 0
     reg:
       required: true