UBUNTU: ODM: mfd: Add support for IO functions of AAEON devices

UBUNTU: ODM: mfd: Add support for IO functions of AAEON devices

BugLink: https://bugs.launchpad.net/bugs/1929504
This adds the supports for multiple IO functions of the
AAEON x86 devices and makes use of the WMI interface to
control the these IO devices including:

- GPIO
- LED
- Watchdog
- HWMON

It also adds the mfd child device drivers to support
the above IO functions.

Signed-off-by: Kunyang_Fan <kunyang_fan@asus.com>
Review-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Review-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>