greybus: connection: add camera-data connected workaround

Firmware currently lacks a representation of the offloaded CDSI
connections and connected requests sent for these ports therefore fails.

Add a temporary work-around until this has been resolved in firmware.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>