Kernel source for Xiaomi Redmi 2

This is the world's first working public kernel source for Redmi 2.

msm8916 skum support: done
diplay drivers: almost done
ft5x06 driver: done // touchscreen
TI BQ2022A driver: todo // battery controller
Awinc AW2013 driver: done // led controller
LiteOn LTR553 driver: almost done
AKM AK09911: done // compass sensor
MPU6050: done // other sensors
Lineout AMP support: done

Known bugs:
- hw color calibration not supported (easy to port from Redmi 1S, but almost useless)
- light sensor needs some calibration