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

commit 63f4a2705f7093ec24599eb744260e46e23e48bc from
https://github.com/altera-opensource/linux-socfpga.git



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: Wenlin Kang <wenlin.kang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>