usr.sbin/makefs: Sync with sys/vfs/hammer2
Sync with following sys/vfs/hammer2 commits.
$ git log --pretty="%h %s" 55066b18244fe9350bb96f93d65807d82b5cd98b.. -- sys/vfs/hammer2/
4f646c6893 sys/vfs/hammer2: Use HAMMER2_LOOKUP_ALWAYS in xop_readdir
6d68a182a9 sys/vfs/hammer2: Add missing error handling in hammer2_remount()
34ad347f7f sys/vfs/hammer2: Fix "Properly set ronly flag for PFS"
9a5c949af7 sys/vfs/hammer2: Properly set ronly flag for PFS
0c9702fdbe sys/vfs/hammer2: Remove duplicate spmp->pfs_hmps[0] initialization
8860585752 sys/vfs/hammer2: Ignore unused return value from hammer2_xop_feed()
bd41e746e6 sys/vfs/hammer2: Add SEEK_HOLE / SEEK_DATA support