Add Xiaomi MI2 (aries)

Needed repositories:
https://github.com/M1cha/android_device_xiaomi_aries (cm-11.0-legacyaudio)
https://github.com/M1cha/android_kernel_xiaomi_aries (cm-11.0)

Change-Id: Idb0886e0ff4c129625ff45f847c2a1cbd7c63428