engines/xnvme: fix fdp support for userspace drivers #707

Job	Run time
build (linux-gcc)	9m 5s
build (linux-clang)	9m 37s
build (macos)	7m 41s
build (linux-i686-gcc)	9m 48s
build (android)	1m 49s
build (windows-cygwin-64)	11m 35s
build (windows-cygwin-32)	11m 32s
build (windows-msys2-64)	10m 57s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	54s
	1h 12m 58s

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