Fix missing private clauses in 3D viscous GPU loops #4639

Job	Run time
Detect File Changes	12s
Lint Gate	1m 14s
Github (macos, mpi, debug, false)	1s
Georgia Tech \| Phoenix (cpu)	30m 8s
Github (ubuntu, no-mpi, single, no-debug, false)	23m 13s
Georgia Tech \| Phoenix (gpu-acc)	1s
Github (macos, mpi, no-debug, false)	30m 8s
Georgia Tech \| Phoenix (gpu-omp)	1s
Github (ubuntu, mpi, no-debug, true)	1s
Github (ubuntu, mpi, no-debug, false)	11m 41s
Github (ubuntu, mpi, debug, false)	30m 8s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Oak Ridge \| Frontier (AMD) (cpu)	1s
Oak Ridge \| Frontier (gpu-omp)	30m 8s
Oak Ridge \| Frontier (gpu-acc)	1s
Github (ubuntu, mpi, debug, true)	1s
Oak Ridge \| Frontier (cpu)	1s
	2h 37m 1s

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