allow forcing HighEndGfx mode

people have already started fipping the lomRam prop to enable
transparent status bar, this will enable it with fewer
repercussions

Change-Id: Ied6de65276425fa1e7db0bf9da35f1932a355172
(cherry picked from commit 695b45c3d326348495b1bdc29c007e3021ebc28d)
Merge "qs: sync volume tile icon" into cm-11.0

(cherry picked from commit 0cd79621e6265970c55ff1cbac8228a16e0ff840)

Conflicts:
	packages/SystemUI/src/com/android/systemui/quicksettings/VolumeTile.java
Merge "systemui: improve DessertCaseDream immersive mode exit" into cm-11.0
(cherry picked from commit 136ffeaed17b4f4861730489ddbd570a258f0613)
Revert "Settings: Add CM PlatLogo & CMCaseView (1/2)"

This reverts commit a8f4f166c46b74ea84d055f51716d5cf1da2aeb7.