Use device specific fstab file

Change-Id: If4bb27406701c710f04eba01efff36935588e1bc
Update system.prop

Remove persist.sys.use_dithering
This commit automatically enables dithering if bitsPerPixel <= 16
https://github.com/androidarmv6/android_frameworks_native/commit/05f952e8cf2972995f61754dbe4cefb415725881

Update dalvik.vm.heaptargetutilization=0.25
Reduces after boot memory footprint by about 5-8MB

Change-Id: I636c33bc0710fbdff14e832d04b00b752618a1a5
Build ril from source (2/3)

Change-Id: I8e784e49e8ac030e50f4495924c44a72c7a2d0c0
Cleanup SD Card mounting

Change-Id: If4c739efc5b5d2ff1ba023c4f8c14963bdc09586