smdk4412-common: fix legacy widevine

-Enable legacy mmap

Change-Id: I5db258e9092f8d43947ee05ebc78fc2727ccacf4
smdk4412-common: cleanup overlay

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

Change-Id: Id117918407c723e340dcbe377d31957be07459e5