arm64:dts: Move DISPLAY_ENABLE, TOUCH_INT and TOUCH_ENABLE from *-pinfunc.h

The GPIOs for DISPLAY_ENABLE, TOUCH_INT and TOUCH_ENABLE have been moved to the top-level .dts files because they may vary with the baseboard/display-combination. Even worse: In the schematics of pConXS the high-active TOUCH_ENABLE input is labeled as low-active WAKE.

Also the panel_lvds node has been removed fron trizeps8mini.dtsi because there are non-LVDS displays and even headless devices.