hw/ipc_nrf5340: (Re-)Fix enabling GPIO passing to network core #2637
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The outcome of #2629 used a bitmask to set which GPIOs the application core handed over to the networking core.
This made for neat code but complicated the syscfg handling.
This PR undoes #2629, the bitmask change, and uses preprocessor magic to accomplish the same with a simple comma separated syscfg value for specifying pins.
Feedback welcome again, and this time I'll hang out for consensus before merging.