Display: Default SRE to off

Facemelt mode is catching people by surprise and being interpreted
as "messed up colors". Default it to off so people can at least see
it kick in as a reaction to enablement

Change-Id: I5816e528363f508fc360c321c702a59f0bb79846
SRE: Add Adaptive backlight as dependency

Change-Id: Ie91def7445985b66b4087d282fb102fde47b423d