allow override of cabc file via property

Note 8's cabc is implemented in mdnie instead of the panel
file like other smdk4x12 devices.

Change-Id: I9bd7c4bb5899cd323e4f6861bf7ceb61f459da05
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_hardware_samsung into cm-10.2