tune for cortex-a7

Change-Id: I066933de1942eb07a4ab45bc47f1eca2f903ac95
ramdisk: switch to row i/o scheduler after boot up

Kernel sets now noop as default scheduler and it is used
during boot up. Switch to ROW when boot is completed.

Change-Id: I55e22131bf61027671f5d8de8dd0a79192e73d6d
sepolicy: Recovery needs to create directories

Change-Id: Ie1c838219fa3c2f869a83d0ed690f099f1a13956