platform/x86: x86-android-tablets: Move Asus tablets to their own file

Move the info for the Asus tablets to their own asus.c file.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20230301092331.7038-7-hdegoede@redhat.com