props: move to system.prop and general cleanup

PS2: Clean up.

Change-Id: I8656d8ba1b837602e9d294762304faf1d4363f53

Conflicts:
	system.prop
Merge branch 'du44' of github.com:nychitman1/android_device_htc_m8-1 into du44

Conflicts:
	system.prop