Fix missing private clauses in 3D viscous GPU loops #4608

Job	Run time
Detect File Changes	12s
Lint Gate	1m 14s
Github (macos, mpi, no-debug, false)	1h 1m 0s
Georgia Tech \| Phoenix (cpu)	1s
Oak Ridge \| Frontier (cpu)	23s
Github (macos, mpi, debug, false)	1h 1m 0s
Oak Ridge \| Frontier (gpu-omp)	1s
Oak Ridge \| Frontier (AMD) (cpu)	1s
Github (ubuntu, no-mpi, single, no-debug, false)	28m 42s
Github (ubuntu, mpi, no-debug, false)	53m 53s
Github (ubuntu, mpi, debug, false)	52m 11s
Github (ubuntu, mpi, debug, true)	53m 12s
Georgia Tech \| Phoenix (gpu-omp)	1h 1m 0s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1h 1m 0s
Georgia Tech \| Phoenix (gpu-acc)	1s
Github (ubuntu, mpi, no-debug, true)	52m 19s
Oak Ridge \| Frontier (gpu-acc)	1h 1m 0s
	9h 7m 10s

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