hammerhead: Add mpdecision to system group

File ownership is set by ueventd. Upstream commit:
bf8fcfa71fd365add34a394cbe38828ce8a558fb

Change-Id: I7e67f6aafce876b07a099120aa1bc760ab254d20
hammerhead: Fix default value of color calibration

Revert to default kernel value

Change-Id: Ia9315482c6286356637015f5a4891ac99bb52dcf
Merge "hammerhead: Add mpdecision to system group" into cm-11.0
Merge remote-tracking branch 'upstream/cm-11.0' into berserk