quirks: Add quirks for Acer Switch Alpha 12
This is a 2-in-1 laptop with detachable keyboard. The AT keyboard device is used for tablet-integrated keys (volume, leftmeta) and should not get disabled with tablet-mode enabled.
The touchpad integrated in the detachable keyboard is already handled through the "Acer Hawaii Keyboard" chicony rule.
Related: #115 (closed)
Signed-off-by: Carlos Garnacho carlosg@gnome.org