net: ipc_router: Initialize IPC Router on a first interface attempt

The clients of IPC Router are initialized and they attempt to interface
with IPC Router before it is initialized. The clients are blocked until
the IPC Router is initialized. Instead initialize IPC Router on a first
interface attempt.

Change-Id: I7e4d4eb837e9d04df1ec9f1d0b03703d0ba5b061
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>