firmware: qcom_scm: Add memory protection API for MDF

Add memory protection API for MultiDSP framework as scm_call2
is depreciated on latest kernel.

Change-Id: I935f29bf958e57498fd115022d9f6352adbab861
Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
Signed-off-by: Elliot Berman <eberman@codeaurora.org>