net: ipc_router: Cleanup redundant code

msm_ipc_router_send_control_msg() and broadcast_ctl_msg_locally() are
similar. Move all the common code to msm_ipc_router_send_control_msg() and
cleanup broadcast_ctl_msg_locally()

Update the msm_ipc_router_send_control_msg() function name to
ipc_router_send_ctl_msg() to be consistent with the file name.

Change-Id: Id7aa7de3d076fac146d3600365a5e4f382e0c6a8
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>