d2lte: add mpdecision to system group

Change-Id: Ic669a0eb87a300a278359a4963307c10413a440f
Reference: https://android.googlesource.com/device/lge/hammerhead/+/bf8fcfa71fd365add34a394cbe38828ce8a558fb%5E!/#F0
d2lte: enable KSM

Change-Id: I47f51c50160db69bbeab45e3c1aac974a3bb3824
d2lte: add permissions for keydisabler

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

Change-Id: I4666c427d7d100327ab315e13f3f12e14ca99a70
Merge remote-tracking branch 'github/cm-11.0' into HEAD