n80xx: Remove config_forceDisableHardwareKeyboard from overlay

I assume we'll want to either fix the driver or disable it rather than maintain
a hack.
n80xx: Add TW_IGNORE_MAJOR_AXIS_0 := true

This fixes the twitchy/buggy touchscreen interface in TWRP.
n80xx: Add custom init.recovery.smdk4x12.rc to fix idVendor and idProduct

I'm not actually sure if the idProduct is correct, but at the least it's closer
to being correct. This solves the issue I had where I needed to start adb as
root on my computer to access adb in recovery.