evita: 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: I30b73dae4906b389882aa663725c7fc00fc777f4
Signed-off-by: Rohan Mathur <rohanmathur34@gmail.com>