build

nvme: add low-level APIs to map prp/sgl without @rq #383

Job	Run time
basic sanity build	1m 18s
nix build	48s
run emulated nvme device tests	0s
compiler builds (gcc)	30s
distribution builds (almalinux, 8)	38s
compiler builds (clang)	10s
distribution builds (almalinux, 9)	29s
run scan-build	22s
run sparse	31s
distribution builds (alpine, latest)	19s
distribution builds (archlinux, latest)	28s
distribution builds (debian, trixie)	32s
distribution builds (debian, bookworm)	28s
distribution builds (debian, bullseye)	32s
distribution builds (debian, buster)	44s
distribution builds (fedora, rawhide)	32s
distribution builds (fedora, 41)	41s
distribution builds (fedora, 40)	34s
distribution builds (rockylinux, 8)	39s
distribution builds (rockylinux, 9)	30s
distribution builds (ubuntu, oracular)	33s
distribution builds (ubuntu, noble)	30s
distribution builds (ubuntu, jammy)	25s
distribution builds (ubuntu, focal)	36s
	12m 49s

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