HSD #14011791668: firmware: stratix10-rsu: extend RSU driver to get DCMF status

commit  6fe8d830d6ebb0a6d4e4694d2a7be8d395f46792 from
https://github.com/altera-opensource/linux-socfpga.git

Extend RSU driver to get DCMF status.

The status of each DCMF is reported. The currently used DCMF is used as
reference, while the other three are compared against it to determine if
they are corrupted.

DCMF = Decision Configuration Management Firmware.
RSU = Remote System Update

Signed-off-by: Radu Bacrau <radu.bacrau@intel.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>