greybus: arche-apb-ctrl: Do not coldboot APBs in probe

Since parent driver (SVC) is controlling APBs directly, we do not
need to bringup APBs in its own probe.

Testing Done: Tested on EVT1.2.

Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Reviewed-by: Michael Scott <michael.scott@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>