xfs: remove static reap limits from repair.h

Delete XREAP_MAX_BINVAL and XREAP_MAX_DEFER_CHAIN because the reap code
now calculates those limits dynamically, so they're no longer needed.

Move the third limit (XREP_MAX_ITRUNCATE_EFIS) to the one file that uses
it.  Note that the btree rebuilding code should reserve exactly the
number of blocks needed to rebuild a btree, so it is rare that the newbt
code will need to add any EFIs to the commit transaction.  That's why
that static limit remains.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>