net: ipc_router: Handling msm ssr scenario

Ipc router core won't forward client/service remove
control messages behalf of remote end in case of msm
ssr as ipc router not registering the remote port
information if ports are not intended to communicate
with local host. Which will keep the client/service
information on modem even after msm ssr and will cause
communication error after msm reboot.

Saving remote port reference in message forward path
will solve this issue as ipc router using this remote
port entry table to cleanup client/service during ssr.

Change-Id: I068445319b0b52640439476c9413c331a66b5675
Signed-off-by: Arun Prakash <app@codeaurora.org>