firmware: stratix10-svc: Add support for RSU commands in asynchronous framework

firmware: stratix10-svc: Add support for RSU commands in asynchronous framework

Integrate Remote System Update(RSU) service commands into the
asynchronous framework for communicating with SDM. This allows the RSU
commands to be processed asynchronously, improving the responsiveness
of the Stratix10 service channel.

The asynchronous framework now supports the following RSU commands:
* COMMAND_RSU_GET_SPT_TABLE
* COMMAND_RSU_STATUS
* COMMAND_RSU_NOTIFY

Signed-off-by: Mahesh Rao <mahesh.rao@altera.com>
Reviewed-by: Matthew Gerlach <matthew.gerlach@altera.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>