Some devices need light sensor enabled for kb and button backlight

Change-Id: Ic883779856cb19fb20c46a6896dbbf03855b4b0d
mergefix

Change-Id: Id5987299087ece1aec51f1b2d024d45177c4c496
add config_alwaysEnableLightSensor to public.xml

Change-Id: Ibd563eb69be25cea6a9c6d5374e590cd647250dd