fdatasync()
`fdatasync()` is basically equivalent to `fsync()` according to the standards. Added test for it. Signed-off-by: Yong Cong Sin <ycsin@meta.com>
This change deprecates CONFIG_POSIX_FS in favour of CONFIG_POSIX_FILE_SYSTEM, which maps directly to the name of the standard POSIX Option Group. Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>