xfs: remove CPU hotplug infrastructure

There are no users of the cpu hotplug hooks in xfs now, so remove it.
This reverts f1653c2e2831e ("xfs: introduce CPU hotplug
infrastructure").

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
2 files changed