Extend SEPolicy

Change-Id: I433788c441341062f3b61b5409716b8c9356d962
Fill out some qcom related build flags

Change-Id: Iecd44b7bec0b58d7eb4b2df1fea5e81fb2298677
Specify twrp RECOVERY_VARIANT

Change-Id: I1ea394e5753d46f92d95598666ee6de6145ca256
Use BatteryLED library for charging indicator

Change-Id: I5d21800ebf09343b2dfef5841f79db46eca77490