Build

SERCOM async/DMA for Wire, SPI, and UART #461

Job	Run time
build (metro_m0)	2m 25s
build (metro_m0:usbstack=tinyusb)	6m 2s
build (metro_m4)	2m 5s
build (pygamer_m4)	2m 7s
build (hallowing_m4)	2m 20s
build (pyportal_m4)	2m 8s
build (circuitplayground_m0)	2m 14s
build (pybadge_m4)	2m 20s
build (hallowing)	2m 12s
build (feather_m4_can)	2m 21s
build (pyportal_m4_titano)	2m 20s
build (metro_m4:speed=120,usbstack=tinyusb)	6m 32s
	35m 6s

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