HSD #1509644685 firmware: stratix10-svc: Generic Mailbox Command

commit ec02ee3c55a96e0a82f82b77a91e05eaf59811fc 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>