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>
evita: remove unnecessary BoardConfig parameters

BOARD_SUPPRESS_EMMC_WIPE: according to http://review.cyanogenmod.org/17326 ,
this is only relevant to Samsung devices with buggy firmware

BOARD_USES_MMCUTIL: cannot find source that utilizes this

Change-Id: Ib4c2f1f7826252e74fb9006533442b46c33cf589
evita: support building TWRP

Change-Id: I2eefceb125f19ad2e84d9139ee209eca2264238b