FSI mux line on AC922 connector routed to USB_DN #2

The FSI mux signal from the Sequoia connector, pin E4, is connected to pin B51 of the DC-SCI connector.

However, B51 is a USB2_DN signal, so isn't suitable as the FSI mux input

It would probably make more sense to move this to one of the I3C pins, like the FSI clk/dat lines.

On the Artix DC-SCM implementation, this is connected to a separate USB device, and not the FPGA, so we can't work-around this in gateware.

The FSI mux signal from the Sequoia connector, pin E4, is connected to pin B51 of the DC-SCI connector. However, B51 is a `USB2_DN` signal, so isn't suitable as the FSI mux input It would probably make more sense to move this to one of the I3C pins, like the FSI clk/dat lines. On the Artix DC-SCM implementation, this is connected to a separate USB device, and not the FPGA, so we can't work-around this in gateware.

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FSI mux line on AC922 connector routed to USB_DN #2