Clean up for AOSPA

TEMPORARY: remove off-screen gesture & button brightness support
TEMPORARY: comment out missed line from 3caa0f31fc2e042aa463c32378adc17ae62d608d
Revert "root: Add busybox to ramdisk"

This reverts commit c7fa17f06934966017a35b9d36425535bb8a805c.
Revert "Make recovery init device-specific for LVM"

This reverts commit 7807d89ea46a77bb7295c2984497662edc31f428.
BoardConfigCommon: AOSPA Disable secure discard flag
Revert "Revert "Make recovery init device-specific for LVM""

This reverts commit 0da42ba20f135904522518c7bc69d19367f684cf.