Tell the kernel to keep extra ~9MB memory free
Update sdcard perms
Enable low RAM feature on NS

It will

 * disable highGfxAccel, so transparent UI effects will be turned off
 * use RGB_565 for thumbnails instead of ARGB_8888
 * reduce Max recent tasts in background
 * reduce Broadcast history/queue and audio system footprints
Board has NEON support
Work around for app to sdcard function