platform/x86: alienware-wmi-wmax: Expose GPIO debug methods

platform/x86: alienware-wmi-wmax: Expose GPIO debug methods

Expose GPIO control methods present on the AWCC interface through
DebugFS.

These models come with an RGB lighting STM32 MCU, which usually has two
GPIO pins with debug capabilities:

 - Pin 0: Device Firmware Update mode (DFU)
 - Pin 1: Negative Reset (NRST)

Suggested-by: Gabriel Marcano <gabemarcano@yahoo.com>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Signed-off-by: Kurt Borja <kuurtb@gmail.com>
Link: https://lore.kernel.org/r/20250505-awcc-gpio-v4-1-edda44c3a0dc@gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>