Android: Handle duplicate axis, and fix known bad axis.

Android reports the same physical axis multiple times for analog
triggers, and this handles this case.

There are also some controllers with broken mappings (eg the analog
triggers on a PS4 DualShock 4). These axis don't center correctly.

There are also some controllers (again, the PS4) that send both a button
press and an axis movement. This ignores the buttons so we can use the
analog axis. Otherwise, since the button comes before the axis moves
far we would always take the button.

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