Extend SEPolicy

Change-Id: Ib6d6204c1eda87d02d82e9f49c0707c65cf222e5
Fill out some qcom related build flags

Change-Id: I7cc529bc394d1f1f9b4f3fde2e8edc0d2fc91446
Specify twrp RECOVERY_VARIANT

Change-Id: I74f598e4f6b15ba5dd86d2ec915d8d8bd35601d2
Use BatteryLED library for charging indicator

Change-Id: Ifc71eb9581d04a05104fcb62d5ba70e4b84230a2