xfs: widen EFI format to support rt

Realtime reverse mapping (and beyond that, realtime reflink) needs to be
able to defer file mapping and extent freeing work in much the same
manner as is required on the data volume.  Make the extent freeing log
items operate on rt extents in preparation for realtime rmap.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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