dt-bindings: input: touchscreen: convert lpc32xx-tsc.txt to yaml format

Convert lpc32xx-tsc.txt to yaml format.

Additional changes:
- add clocks and put it into required list to match existed lpc32xx.dtsi.

Signed-off-by: Frank Li <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

Documentation/devicetree/bindings/input/touchscreen/lpc32xx-tsc.txt

···
-* NXP LPC32xx SoC Touchscreen Controller (TSC)
-
-Required properties:
-- compatible: must be "nxp,lpc3220-tsc"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- interrupts: The TSC/ADC interrupt
-
-Example:
-
-	tsc@40048000 {
-		compatible = "nxp,lpc3220-tsc";
-		reg = <0x40048000 0x1000>;
-		interrupt-parent = <&mic>;
-		interrupts = <39 0>;
-	};

Documentation/devicetree/bindings/input/touchscreen/nxp,lpc3220-tsc.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/nxp,lpc3220-tsc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP LPC32xx SoC Touchscreen Controller (TSC)
+
+maintainers:
+  - Frank Li <[e-mail]>
+
+properties:
+  compatible:
+    const: nxp,lpc3220-tsc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/lpc32xx-clock.h>
+
+    touchscreen@40048000 {
+        compatible = "nxp,lpc3220-tsc";
+        reg = <0x40048000 0x1000>;
+        interrupt-parent = <&mic>;
+        interrupts = <39 0>;
+        clocks = <&clk LPC32XX_CLK_ADC>;
+    };