Fixing Xiaomi Piston 2 headset support#2

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JustAMan wants to merge 5 commits intoM1cha:cm-11.0from

JustAMan:cm-11.0-xiaomi-headset

Commits on Sep 7, 2014

Changed the driver that detects headset buttons to work with Xiaomi Piston 2
Vasilij Litvinov
committed
Further trying to fix Xiaomi Pistons 2 on Mi2s
Vasilij Litvinov
committed
Fixed Xiaomi Pistons 2 support
Vasilij Litvinov
committed
Revert "Further trying to fix Xiaomi Pistons 2 on Mi2s"
Vasilij Litvinov
committed
Some tab nice-ing
Vasilij Litvinov
committed