xfs: move perag structure and setup to libxfs/xfs_ag.[ch]

xfs: move perag structure and setup to libxfs/xfs_ag.[ch]

Source kernel commit: 07b6403a6873045344b0c18cbb4a4360854f6d76

Move the xfs_perag infrastructure to the libxfs files that contain
all the per AG infrastructure. This helps set up for passing perags
around all the code instead of bare agnos with minimal extra
includes for existing files.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>