Specify nrext64 option when creating XFS filesystem #4356

Job	Run time
stratis-min-cli-checks	2m 23s
checks_with_tang (TANG_URL=tang RUST_LOG=stratisd=debug make -f Makefile test-clevis-loop, 1.74.0...	12m 30s
checks (make -f Makefile fmt-ci, 1.74.0, rustfmt)	1m 7s
checks (make -f Makefile check-typos, 1.74.0, cargo)	1m 0s
stratis-cli-checks	9m 14s
python-based-tests	2m 42s
tests-with-testing-repo (HEAD)	25m 11s
shell-checks	40s
tests-with-testing-repo (v3.6.0)	24m 37s
	1h 19m 24s

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