SUNRPC: Clean up svc_deferred_class trace events

[ Upstream commit 45cb7955 ]

Replace the temporary fix from commit 4d500445 ("SUNRPC: Fix the
svc_deferred_event trace class") with the use of __sockaddr and
friends, which is the preferred solution (but only available in 5.18
and newer).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Stable-dep-of: 948f072a ("SUNRPC: always free ctxt when freeing deferred request")
Signed-off-by: Sasha Levin <sashal@kernel.org>