CarpetX: Enable managed memory by default for non-HIP machine #1050

Job	Run time
download-build-test (cpu, real32, debug)	8m 39s
download-build-test (cpu, real64, debug)	8m 36s
download-build-test (cpu, real64, optimize)	13m 13s
download-build-test (cuda, real32, debug)	20m 47s
download-build-test (cuda, real64, debug)	21m 33s
download-build-test (cuda, real64, optimize)	19m 28s
download-build-test (rocm, real64, debug)	15m 55s
download-build-test (rocm, real64, optimize)	16m 40s
	2h 4m 51s

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