rp2xxx: enable all riscv features #128

Job	Run time
Dry Run Packaging	1m 25s
Build Website	21s
Build (ubuntu-latest)	24s
Build Examples (espressif/esp)	2m 18s
Build (windows-latest)	1m 58s
Check that stm32 generated code is up to date	39s
Build Examples (gigadevice/gd32)	2m 16s
Build (macos-latest)	28s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	17s
Build Examples (microchip/avr)	2m 8s
Build Examples (microchip/atsam)	2m 5s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	25s
Build Examples (nordic/nrf5x)	2m 7s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	26s
Unit Test UF2 (ubuntu-latest)	15s
Build Examples (nxp/lpc)	1m 57s
Unit Test Regz (ubuntu-latest)	19s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 21s
Unit Test UF2 (windows-latest)	2m 10s
Build Examples (stmicro/stm32)	24s
Unit Test Regz (windows-latest)	1m 20s
Unit Test UF2 (macos-latest)	25s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 6s
Build Examples (raspberrypi/rp2xxx)	2m 23s
Unit Test Regz (macos-latest)	31s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 13s
Build Examples (wch/ch32v)	2m 18s
Unit Test Ports (macos-latest, gigadevice/gd32)	32s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	43s
Unit Test Ports (macos-latest, stmicro/stm32)	24s
	34m 38s

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