inc: set perms for /proc/cmdline

 fixes:
 D/TelephonyManager(  130): No /proc/cmdline
 exception=java.io.FileNotFoundException: /proc/cmdline:
 open failed: EACCES (Permission denied)

Based on this commit that was merged for supersonic:

http://review.evervolv.com/#/c/8787/

Incredible also has this error

Change-Id: Icb0e6d5af55dd538e84d4325d009a1dd0bdb4744