net: ipc_router: Update packet creation helper function

Create a packet with its socket buffer queue either initialized as empty
or assigned to user provided socket buffer queue.

Change-Id: I49bc0f1df5b3f31a12c8f5d2eb0b33f9e1228ff1
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>