ControllerEmu: Add default mappings for Android

Unlike PCs, Android doesn't really have any input method (not counting
touch) that can reasonably be expected to exist on most devices.
Because of this, I don't think shipping with a default mapping for the
buttons and sticks of GameCube controllers and Wii Remotes makes sense.
I would however like to ship default mappings for a few things:

1. Mapping the Wii Remote's accelerometer and gyroscope to the device's
   accelerometer and gyroscope. This functionality is useful mainly
   for people who use the touchscreen, but can also be useful when
   using a clip-on controller. The disadvantage of having this mapped
   by default is that games disable pointer input if the accelerometer
   reports that the Wii Remote is pointed at the ceiling.

2. Mapping GC keyboards for use with a physical keyboard, like on PC.
   After all, there's no other way of mapping them that makes sense.

3. Mapping rumble to the device's vibrator.

Aside from the GC keyboards, this approach is effectively the same as
what we were doing before the input overhaul.

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