dm: Add snapshot of dm-crypt support

This snapshot is taken as of msm-3.10 commit:
bcb5b3f6f2(Merge "msm: mdss: remove notify update ioctl
implementation in driver"). Support of PFT was removed as
it not used anymore.

Change-Id: Iee085f1d6236e97884105e1f228babb77c54d470
Signed-off-by: Dinesh K Garg <dineshg@codeaurora.org>