drivers/intel/fsp1_1: Simplify union references

Simplify the union references to enable Coverity to properly process
the routine.

Found-by: Coverify CID 1349854

TEST=Build and run on Galileo Gen2

Change-Id: I667b9bc5fcde7f68cb9b4c8fa85601998e5c81ff
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14870
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed