xfs: support the XFS_BTNUM_FINOBT free inode btree type

Define the AGI fields for the finobt root/level and add magic
numbers. Update the btree code to add support for the new
XFS_BTNUM_FINOBT inode btree.

The finobt root block is reserved immediately following the inobt
root block in the AG. Update XFS_PREALLOC_BLOCKS() to determine the
starting AG data block based on whether finobt support is enabled.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --cc fs/xfs/xfs_ag.h
Simple merge

diff --cc fs/xfs/xfs_btree.c
Simple merge

diff --cc fs/xfs/xfs_btree.h
Simple merge

diff --cc fs/xfs/xfs_format.h
Simple merge

diff --cc fs/xfs/xfs_ialloc.c
Simple merge

diff --cc fs/xfs/xfs_ialloc_btree.c
Simple merge

diff --cc fs/xfs/xfs_log_recover.c
Simple merge

diff --cc fs/xfs/xfs_stats.c
Simple merge

diff --cc fs/xfs/xfs_stats.h
Simple merge

diff --cc fs/xfs/xfs_types.h
Simple merge