VME: revisit capacitors for SFP
Although 100nF AC coupling capacitors are needed for RX and TX (ug576 p338), they are already included in the SFP. So we don't need those capacitors.
But they are needed for PCIe on the TX side. There are 2 AC coupling capacitors in serial. To be simplified.
In addition to that, the double footprint for SFP1/PCIe must be exclusive: either the SFP1 is used or the PCIe is used. The AC coupling capacitors must be replaced with 0ohm.