t6-common: Fix permissions on CPU parameter nodes

Change-Id: I4056ff3b5b09f1c630ea7a7a1c3397cc80426249
t6-common: use default backlight configuration

Change-Id: I7a924e9e2548af8094605a2f711bb4748b3c030f
t6-common: prima firmware update

*Taken from kernel driver 3.2.2.20

Change-Id: If828c1a233b7fb711fe0d00e78e38204dffdfe6b