More GPIO fixes; changed EPI code for two chip selects

My GPIO fix for pin numbers vs. masks needed to be made in a few more places, so I’ve done that now.

The Intel D7220-1, like many peripheral chips, uses a chip select input (CS) for programmed I/O, but a separate DMA acknowledge (DACK) for DMA transfers. I might only use programmed I/O for this project, but the External Peripheral Interface (EPI) of the Tiva supports 1, 2, or 4 chip selects, so I updated my EPI code to use 2, and will wire the second one to DACK.

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