ARM: dts: imx25: rename node name tcq to touchscreen

Rename node name tcq to touchscreen to fix below CHECK_DTBS warnings:
arch/arm/boot/dts/nxp/imx/imx25-karo-tx25.dtb: tscadc@50030000 (fsl,imx25-tsadc): 'tcq@50030400' does not match any of the regexes: '^adc@[0-9a-f]+$', '^pinctrl-[0-9]+$', '^touchscreen@[0-9a-f]+$'
        from schema $id: http://devicetree.org/schemas/mfd/fsl,imx25-tsadc.yaml

Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: nxpfrankli

arch/arm/boot/dts/nxp/imx/imx25.dtsi

@@ -305,7 +305,7 @@
 					status = "disabled";
 				};
 
-				tsc: tcq@50030400 {
+				tsc: touchscreen@50030400 {
 					compatible = "fsl,imx25-tcq";
 					reg = <0x50030400 0x60>;
 					interrupt-parent = <&tscadc>;