fs: dlm: add midcomms init/start functions

fs: dlm: add midcomms init/start functions

[ Upstream commit 721b8349d0534ccbdef269b55419f3d7ef97e9b6 ]

This patch introduces leftovers of init, start, stop and exit
functionality. The dlm application layer should always call the midcomms
layer which getting aware of such event and redirect it to the lowcomms
layer. Some functionality which is currently handled inside the start
functionality of midcomms and lowcomms should be handled in the init
functionality as it only need to be initialized once when dlm is loaded.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
Stable-dep-of: 5282c6801f3b ("fs: dlm: start midcomms before scand")
Signed-off-by: Sasha Levin <sashal@kernel.org>