MediaControl: Dymically set mainline IVSC media-entity src-pad index #114
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Since mainline kernel commit 48f5fd8967f8 ("media: ivsc: csi: Swap SINK and SOURCE pads") the src-pad on the mainline ivsc mc-entity is pad 1, where as on older versions it is pad 0.
When updating the sensor link to point to the IVSC instead, link.srcPad was left at pad-0 inherited from the original sensor link.
Since with newer kernels this now needs to be pad-1, also update link.srcPad and do so dynamically, so that it works with all mainline IVSC driver versions.
This fixes ipu6-camera-hal / icamerasrc not working on laptops with an IVSC chip running kernels using the mainline IVSC driver with the mentioned commit.