sst: Firmware error codes force number values

To avoid mismatch in driver and firmware error codes assign specfic values
to each enum.

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>