rxrpc: Make the I/O thread take over the call and local processor work

jira LE-1907
Rebuild_History Non-Buildable kernel-5.14.0-284.30.1.el9_2
commit-author David Howells <[email protected]>
commit 5e6ef4f
Empty-Commit: Cherry-Pick Conflicts during history rebuild.
Will be included in final tarball splat. Ref for failed cherry-pick at:
ciq/ciq_backports/kernel-5.14.0-284.30.1.el9_2/5e6ef4f1.failed

Move the functions from the call->processor and local->processor work items
into the domain of the I/O thread.

The call event processor, now called from the I/O thread, then takes over
the job of cranking the call state machine, processing incoming packets and
transmitting DATA, ACK and ABORT packets.  In a future patch,
rxrpc_send_ACK() will transmit the ACK on the spot rather than queuing it
for later transmission.

The call event processor becomes purely received-skb driven.  It only
transmits things in response to events.  We use "pokes" to queue a dummy
skb to make it do things like start/resume transmitting data.  Timer expiry
also results in pokes.

The connection event processor, becomes similar, though crypto events, such
as dealing with CHALLENGE and RESPONSE packets is offloaded to a work item
to avoid doing crypto in the I/O thread.

The local event processor is removed and VERSION response packets are
generated directly from the packet parser.  Similarly, ABORTs generated in
response to protocol errors will be transmitted immediately rather than
being pushed onto a queue for later transmission.

Changes:
========
ver #2)
 - Fix a couple of introduced lock context imbalances.

	Signed-off-by: David Howells <[email protected]>
cc: Marc Dionne <[email protected]>
cc: [email protected]
(cherry picked from commit 5e6ef4f)
	Signed-off-by: Jonathan Maple <[email protected]>

# Conflicts:
#	include/trace/events/rxrpc.h
#	net/rxrpc/ar-internal.h
#	net/rxrpc/call_accept.c
#	net/rxrpc/call_event.c
#	net/rxrpc/call_object.c
#	net/rxrpc/conn_object.c
#	net/rxrpc/input.c
#	net/rxrpc/io_thread.c
#	net/rxrpc/local_event.c
#	net/rxrpc/local_object.c
#	net/rxrpc/output.c
#	net/rxrpc/peer_event.c
#	net/rxrpc/sendmsg.c

Author: PlaidCat