settings: Add support for SRE

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

Change-Id: I9ca388ffd68080f0e497edb81d5f8616c194ea1d
Merge CM upstream translation

Change-Id: Id81e1b4de93f1735d4822bd5d566f3ddadb746bd
Merge remote-tracking branch 'upstream/android-4.4' into android-4.4