oppo-common: Reenable Button illumination in overlay

Change-Id: I720dc2ed6eba52c2d969f4845256f6f4d6c780ab
Signed-off-by: STELIX <ssspinni@gmail.com>
oppo-common: Update hardware keys overlay

Change-Id: I871dac9c356b0fc5c6d4c611e2196dd4c6f2add7
Merge branch 'cm-12.0' of github.com:CyanogenMod/android_device_oppo_common into HEAD