linux: bsp-41x: non-target: Move support for non-connected CSI-2 receiver

If the firmware lists a CSI-2 receiver as enabled but it's not connected
to a CSI-2 transmitter the firmware description is faulty as it only
describes half the CSI-2 bus. The CSI-2 bus is not a plug-and-play bus
so either the bus is populate or it's not. Extending the CSI-2 receiver
to probe and exist in an inoperable state makes no sens.

Note this does not prevent the CSI-2 receiver node from being described
in DT it just can't be enabled if it's not connected to a CSI-2
transmitter.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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