display: Remove genlock usage

genlock is no-op from Android 4.2 onwards since the sync framework
is used for explicit synchronization.

Change-Id: Idd1df589516534a683e0fa1ef0cfbb7f0e411f67
Revert "display: Remove genlock usage"

This reverts commit 3ab805a5f84642e2f8e63641c745f46ff8c450bd.
display: Remove genlock usage

genlock is no-op from Android 4.2 onwards since the sync framework
is used for explicit synchronization.

Change-Id: Idd1df589516534a683e0fa1ef0cfbb7f0e411f67
Merge remote-tracking branch 'cm/cm-10.1' into HEAD