[2/2] SystemUI: Add brightness slider to notification drawer

adds a brightness slider below the expanded statusbar header and
(if enabled) quick settings ribbons

Change-Id: I3dea51561ae26410c6625cbd04a301d785db4aa8
Signed-off-by: anerik <anerikgames@gmail.com>

Conflicts:
	res/values-pt-rBR/cr_strings.xml
	res/values/lego_strings.xml