MDP_DISPLAY_COMMIT_OVERLAY

Per this change:
https://github.com/SaberMod/android_bionic/commit/5115d4348ee720be3db77ae54a06c492049e5ea3

Patched in code bits are from Code Aurora Forum:
https://github.com/SaberMod/android_hardware_qcom_display/blob/sm-jb-mr1-caf/libexternal/external.cpp#L545