Add CSI debug mode for flipping the baseaddr_switch parameter
Baseaddr_switch is a parameter which determines how frames get DMAed from CSI.
There are 2 interesting modes: report a frame for each vsync (default on imx8), and report a frame when request size is reached.
The vsync mode has an issue in that if the bytes between vsync don't match expected request size, the CSI driver will discard that frame, assuming a bug.
For normal operation that is broadly true, but for developing new frame modes, it means no frame is ever submitted to v4l2. This should be configureable as a debug option.