Use single precision math functions for CUDA variants #532

Job	Run time
gnu/9.4.0	45s
gnu/9.4.0 --with-gpu --with-loki --with-atlas	9m 52s
gnu/9.4.0 --with-gpu --with-loki --with-atlas --with-mpi	10m 16s
gnu/9.4.0 --single-precision --with-gpu --with-loki --with-atlas --with-mpi	9m 36s
gnu/9.4.0 --with-serialbox	1m 35s
gnu/9.4.0 --with-serialbox --with-gpu --with-loki --with-atlas	10m 24s
gnu/9.4.0 --with-serialbox --with-gpu --with-loki --with-atlas --with-mpi	10m 40s
gnu/9.4.0 --with-serialbox --single-precision --with-gpu --with-loki --with-atlas --with-mpi	10m 19s
gnu/9.4.0 --cloudsc-fortran-pyiface=ON --cloudsc-python-f2py=ON	1m 51s
nvhpc/21.9 --with-gpu --with-loki --cmake="ENABLE_ACC=OFF"	16m 14s
nvhpc/21.9 --with-gpu --with-loki --with-cuda	29m 26s
nvhpc/21.9 --single-precision --with-gpu --with-loki --with-cuda --with-atlas	38m 30s
nvhpc/21.9 --with-serialbox --with-gpu --with-loki --with-cuda --with-atlas	36m 34s
nvhpc/23.5 --with-gpu --with-loki --cmake="ENABLE_ACC=OFF"	12m 29s
nvhpc/23.5 --with-gpu --with-loki --with-cuda	24m 53s
nvhpc/23.5 --single-precision --with-gpu --with-loki --with-cuda --with-atlas	37m 23s
nvhpc/23.5 --with-serialbox --with-gpu --with-loki --with-cuda --with-atlas	32m 26s
	4h 53m 13s

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