xfs: scrub inode core when checking metadata files

Running the online fsck QA fuzz tests, I noticed that we were
consistently missing fuzzed records in the inode cores of the realtime
freespace files and the quota files.  This patch adds the ability to
check inode cores in xchk_metadata_inode_forks.

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