d2lte: add permissions for keydisabler

Change-Id: Ie5053da2473f2f62ac79320838f76b19a5551d24
Increase read-ahead to 512 KB and read ahead on mmcblk1 too

Change-Id: I4666c427d7d100327ab315e13f3f12e14ca99a70
wlan: Improve W-Fi data transmission stablity

Update gDataInactivityTimeout parameters from 20 to 200ms to improve
wifi throughput when DUT connect to Broadcom solution Mobile Hotspot.

All credits go to XDA-member kalo86
http://forum.xda-developers.com/nexus-4/development/wifi-fix-updated-nexus-4-wireless-t2300873

Change-Id: I6541b439d6aebad5ff8e9b461ceaad7cbd338da7