HSD #1509644685 crypto: intel_fcs: Generic Mailbox Command

commit 271e390d3a3a7daca1f27cd574d837a7cada1e18 from
https://github.com/altera-opensource/linux-socfpga.git

 socfpga-5.15.30-lts.

Add generic mailbox command that can support SDM command. User can use this
command to send SDM mailbox command. User have to specified an input file
which contain the command data and an output file for SDM response to be
copied over.

Signed-off-by: Teh, Wen Ping <wen.ping.teh@intel.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>