Added pin definitions for GP29. #115

Job	Run time
scheduler	50s
mpy-cross-mac	27s
mpy-cross / build (static-raspbian)	43s
tests / run (native_mpy)	39s
tests / run (all)	1m 4s
mpy-cross / build (static-aarch64)	35s
mpy-cross / build (static)	25s
mpy-cross / build (static-mingw)	1m 7s
tests / run (native)	48s
tests / run (mpy)	41s
tests / zephyr	15m 7s
docs	0s
windows-zephyr	0s
windows	0s
ports (raspberrypi) / board (cytron_maker_pi_rp2040)	2m 16s
	24m 42s

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