Revert "add support for Smart Cover HAL"

This reverts commit 1d7fa0d22f3da73905f90ce20367a213d7609af1.

Change-Id: Idb171e0415e20d197d61851434c12aebe41dbafc
Add support for using the flip switch to turn off the screen

Change-Id: I3457af831bf5e9cd2d49efda52fb5961fee5d68f