Prepare for cm-10.2/cm-11.0

Change-Id: I5ecaaeb687d68d31c25dcb9848a85083dadb7fa5
Remove unneeded backlight path definition

Change-Id: I414fc89766fc466e23393119f67ab8a0bd93b62a
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: I214f04538411c53b187247ddb6a52a899f7bb94c