staging: vchiq_arm: Improve initial VCHIQ connect

The code to start the keep-alive thread on initial VCHIQ connect
within vchiq_platform_conn_state_changed is unnecessary complex.
Move the keep-alive thread wake-up into a separate function and call it
during VCHIQ connect.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Link: https://lore.kernel.org/r/20250309125014.37166-6-wahrenst@gmx.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>