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do not assign NFC antenna pins for GPIO use #5

Job	Run time
build (circuitplayground_nrf52840)	1s
build (clue_nrf52840)	1s
build (feather_nrf52832)	1s
build (feather_nrf52840_express)	1s
build (feather_nrf52840_sense)	1s
build (itsybitsy_nrf52840_express)	1s
build (metro_nrf52840_express)	1s
build (adm_b_nrf52840_1)	1s
build (ae_bl652_bo)	1s
build (aramcon_badge_2019)	1s
build (aramcon2_badge)	1s
build (arcade_feather_nrf52840_express)	1s
build (arduino_nano_33_ble)	1s
build (bast_ble)	1s
build (bluemicro_nrf52840)	1s
build (ebyte_e104_bt5032a)	1s
build (ebyte_e73_tbb)	1s
build (electronut_labs_papyr)	1s
build (ikigaisense_vita)	1s
build (m60_keyboard)	1s
build (mdk_nrf52840_dongle)	1s
build (nice_nano)	1s
build (nrf52840_m2)	1s
build (ohs2020_badge)	1s
build (particle_argon)	1s
build (particle_boron)	1s
build (particle_xenon)	1s
build (pca10056)	1s
build (pca10059)	1s
build (pca10100)	1s
build (pitaya_go)	1s
build (raytac_mdbt50q_rx)	1s
build (sparkfun_nrf52840_micromod)	1s
build (waveshare_nrf52840_eval)	1s
	34s

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