Extend SEPolicy

Change-Id: I76159a676bba55371afe40a7bc7c3ae81f22a2e4
Fill out some qcom related build flags

Change-Id: I961b9f15d5a1de0552ae84e2610474cc5a070330
Specify twrp RECOVERY_VARIANT

Change-Id: I21587a06bd11bb4dd7667a74a7482a69a2fe009b
Use BatteryLED library for charging indicator

Change-Id: I0bc00cddb9a845bc72df77b6057d91ba444a7e5e