encryption: needed changes to allow encryption of data partition

1) cryptfs.c requires fstab be named fstab.${ro.hardware}
2) include encyptable parameter on /data in fstab
3) formatting /data in recovery leaves 16kb trailing
4) make fstab.qcom available to recovery

Change-Id: I7e577bdf3e28d0d727f9e083f9a90a5420c0db2c