HSD #18011523007: svc: stratix10-svc: additional changes for SDOS

commit  e44826bab2df21295eef9757d31b15332e9cdd79 from
https://github.com/altera-opensource/linux-socfpga.git



Correct the COMMAND_POLL_SERVICE_STATUS returns, SVC handles both input
and output buffers. SMC call sends all 6 registers for SDOS and includes
size for status enquiry. Clean up SMC protocol definitions.

Signed-off-by: Richard Gong <richard.gong@intel.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>