Prepare for cm-10.2/cm-11.0

Change-Id: Ia1d156d9eb817ca62ebc4bb9d163e4cfb62364ef
Remove unneeded backlight path definition

Change-Id: I2bb50ca413488281d04b92a55bd8f00552f0c150
Remove USB mass_storage setting from device init

USB mass_storage mode is now set and unset automatically in the default
TWRP init.rc.

Change-Id: I65c87b0e11661586b451761fdbf1a0a3a170ec37