smdk4412-common: cleanup overlay

Change-Id: I5bc68025f7601a80dac5ae1102a63e2ceffad387
fix permission denied when wpa_supplicant opens rfkill dev.

Change-Id: Id117918407c723e340dcbe377d31957be07459e5
smdk4412-common: overrides for Healthd led/backlight paths

this is in prep for removing lpm.rc

Change-Id: I31f719c6cd7fddfca5a6b6d7096ba21e4d5d375d