msm: ipc: Do not load any subsystem by default

Some users of IPC Router like IPC Router Security Configuration (IRSC)
open up a socket, perform some configuration/lookup operation quickly and
then close the socket. This causes the IPC Router to load a subsystem by
default and then unload it immediately. This behavior causes the subsystem
to lock up sometimes during the boot process.

Remove loading and unloading a subsystem by default during the socket
create and close operation.

CRs-Fixed: 480156
Change-Id: I9c1c01c18a538a462bcf65902e496bc773a03991
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>