msm: crypto: Add support for map and unmap ioctls

Expose map and unmap ioctls to userspace. These
ioctls can be used by userspace clients to map
ion memory and get virtual address to be consumed
by the Crypto hardware.

CRs-Fixed: 1072414
Change-Id: I141b984a65aefcfc676685dffe19e6c8d022f2e1
Signed-off-by: Sonal Gupta <sonalg@codeaurora.org>