Allow NFC pins to be used for other purposes. #1678
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Fixes #1300. We don't support NFC, so the NFC pins can be used for other purposes. This sets a
#define(in the right place) so that the nRF startup code will flip a bit that enables these pins to be used for non-NFC purposes.Note that on the PCA10056 board, some jumpers must be moved to make the the black female headers for these pins be connected. See section "8.13 NFC antenna interface" in the nRF52840 DK PDF for more information. More info about possible pin limitations as well in in #1300.
Tagging @uhrheber.
I tested this on PCA10056.