Allow telephony access to proc/cmdline

Otherwise on toro you get:
D/TelephonyManager(  131): No /proc/cmdline exception=java.io.FileNotFoundException:
/proc/cmdline: open failed: EACCES (Permission denied)

Change-Id: I2685959d485be3e29a738bc6287fdd99dc52b771
Merge branch 'cm-10.2' into martincz