smdk4412-common: fix legacy widevine

-Enable legacy mmap

Change-Id: I5db258e9092f8d43947ee05ebc78fc2727ccacf4
smdk4412-common: cleanup overlay

Change-Id: I5bc68025f7601a80dac5ae1102a63e2ceffad387
Merge branch 'cm-12.0' of https://github.com/CyanogenMod/android_device_samsung_smdk4412-common into cm-12.0