UPSTREAM: firmware: scmi: mailbox/smt agent device

This change implements a mailbox transport using SMT format for SCMI
exchanges. This implementation follows the Linux kernel and
SCP-firmware [1] a

UPSTREAM: firmware: scmi: mailbox/smt agent device

This change implements a mailbox transport using SMT format for SCMI
exchanges. This implementation follows the Linux kernel and
SCP-firmware [1] as references implementation for SCMI message
processing using SMT format for communication channel meta-data.

Use of mailboxes in SCMI FDT bindings are defined in the Linux kernel
DT bindings since v4.17.

Links: [1] https://github.com/ARM-software/SCP-firmware
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

(cherry picked from commit 240720e9052fa7459e4d8a46d508db1ae41ed238)
Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I02ed9ea6925d9d90e8b46deecd9137ed78172f94

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