d2-common: update auto_brightness permission

Fixes:
W/System.err( 2813): java.io.FileNotFoundException: /sys/class/lcd/panel/panel/auto_brightness: open failed: EACCES (Permission denied)

Change-Id: I9203fb2c6dd9abc3bbb3e2d94f2a3fc3898e5e46
Merge branch 'cm-10.2' into martincz