settings: Add support for SRE

 * Add support for sunlight readability enhancement
 * Optionally depends on adaptive backlight, depending on HAL

Change-Id: I9ca388ffd68080f0e497edb81d5f8616c194ea1d
Merge branch 'cm-11.0' into kk_mkt

Conflicts:
	src/com/android/settings/DisplaySettings.java

Change-Id: Icfe7e6d21f6dbcf57ad6d6fa265bd40962756b48