xfs/157,xfs/547,xfs/548: switch to using _scratch_mkfs_sized

xfs/157,xfs/547,xfs/548: switch to using _scratch_mkfs_sized

These test cases specify small -d sizes which combined with a rt dev of
unrestricted size and the rtrmap feature can cause mkfs to fail with
error:

mkfs.xfs: cannot handle expansion of realtime rmap btree; need <x> free
blocks, have <y>

This is due to that the -d size is not big enough to support the
metadata space allocation required for the rt groups.

Switch to use _scratch_mkfs_sized that sets up the -r size parameter
to avoid this. If -r size=x and -d size=x we will not risk running
out of space on the ddev as the metadata size is just a fraction of
the rt data size.

Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>