Fix rp2xxx UART0_TX available pins #196

Job	Run time
Build (ubuntu-latest)	32s
Build Examples (espressif/esp)	2m 11s
Build (windows-latest)	1m 14s
Build Examples (gigadevice/gd32)	2m 19s
Build (macos-latest)	30s
Build Website	19s
Dry Run Packaging	1m 48s
Build Examples (microchip/avr)	2m 15s
Check that stm32 generated code is up to date	49s
Build Examples (microchip/atsam)	1m 55s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	16s
Build Examples (nordic/nrf5x)	1m 57s
Unit Test Regz (ubuntu-latest)	18s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	21s
Build Examples (nxp/lpc)	1m 57s
Unit Test Regz (windows-latest)	1m 14s
Unit Test UF2 (ubuntu-latest)	16s
Build Examples (stmicro/stm32)	28s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	22s
Unit Test Regz (macos-latest)	29s
Build Examples (raspberrypi/rp2xxx)	2m 27s
Unit Test UF2 (windows-latest)	1m 18s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 11s
Build Examples (wch/ch32v)	2m 19s
Unit Test UF2 (macos-latest)	27s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 14s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 20s
Unit Test Ports (macos-latest, gigadevice/gd32)	28s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	32s
Unit Test Ports (macos-latest, stmicro/stm32)	21s
	33m 7s

Provide feedback