gk110: fix sfuop mask
gk110: fix sfuop mask

This prevents FSET's decoding as MUFU.RCP's

MoochMcGee/envytools,MoochMcGee/envytools,envytools/envytools,pierremoreau/envytools,MoochMcGee/envytools,envytools/envytools,MoochMcGee/envytools,pierremoreau/envytools,envytools/envytools,karolherbst/envytools,pierremoreau/envytools,envytools/envytools,MoochMcGee/envytools,karolherbst/envytools,grate-driver/envytools,karolherbst/envytools,hakzsam/envytools,hakzsam/envytools,hakzsam/envytools,envytools/envytools,karolherbst/envytools,grate-driver/envytools,hakzsam/envytools,grate-driver/envytools,karolherbst/envytools,pierremoreau/envytools,grate-driver/envytools,grate-driver/envytools,pierremoreau/envytools,hakzsam/envytools