net: ipc_router: Register the service with "SVC" prefix

Since IPC Router is used for non-QMI message communication purposes, add
"SVC" prefix to the service name instead of "QMI" prefix.

Change-Id: I5c97d6e4652df3c365e45d8b636bb63b798bdda8
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>