mke2fs: don't print warnings about dax to stderr

mke2fs: don't print warnings about dax to stderr

mke2fs prints a warning to standard error if the target device supports
fsdax but the fs block size doesn't match the page size.  This isn't an
error since we don't abort the format and the filesystem will work just
fine if the user doesn't care about fsdax.

Therefore, print the warning to stdout, not stderr.

Cc: <linux-ext4@vger.kernel.org> # v1.45.7
Fixes: f4979dd566acc4 ("mke2fs: Warn if fs block size is incompatible with DAX")
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>