The reporting of the RPC queue name needs to use the __string()
event interface.
Reported-by: NNeil Horman <nhorman@redhat.com>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

Add declarations to allow tracing of RPC call creation, running, sleeping,
and destruction.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>