net: ipc_router: Do not map server lookup mask

Mapping one lookup mask to another does not produce the client-expected
behavior during the server lookup operation. The existing clients of IPC
Router are specifying the lookup mask explicitly.

Do not map one server lookup mask to another.

Change-Id: I7e9190e8d0f93f0c4f92a45dd0d7f6ae1287b8b2
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>