apq8064-common: Give keydisabler rights to gpio-keys node

* CMHW keydisabler requires access to this to actually disable the
  the hardware key through the gpio-keys driver.

Change-Id: I2dd108572f1d4ab67212b494de0102cafa0f628c
(cherry picked from commit aac6470547c70a0c46f1760e9efe1e093fce8cfc)