ARM: dts: imx6: rename touch-thermal0 to touch-0-thermal

ARM: dts: imx6: rename touch-thermal0 to touch-0-thermal

Rename touch-thermal0 to touch-0-thermal to fix below CHECK_DTBS warnings:
arch/arm/boot/dts/nxp/imx/imx6dl-plym2m.dtb: thermal-zones: 'touch-thermal0', 'touch-thermal1' do not match any of the regexes: '^[a-zA-Z][a-zA-Z0-9\\-]{1,10}-thermal$', 'pinctrl-[0-9]+'
        from schema $id: http://devicetree.org/schemas/thermal/thermal-zones.yaml

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>