.../boards/bdmicro_vina_d51: PAD updates for better resource flexibility #3635
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Update pad assignments for better resource allocations and ensure that the default I2C is is present on a high-speed capable pair of pads to be fully compliant with I2C spec. Ensure all Dx pins are on TCCx within the same IOSET and non-overlapping so all can be used simultaneously. Ensure all intended SERCOM peripherals are on the same IOSET. Remove second clock source pins for I2S since we can't get them all on the same IOSET and still maintain QSPI - defer to QSPI over the second clock source for I2S. Replace those with a few additional Dx pins.