ARKV6X RC IN USART6 4.5 Backport #32110

Job	Run time
build (chibios, Durandal)	18m 54s
build (chibios, MatekF405)	18m 8s
build (chibios, KakuteF7)	16m 17s
build (chibios, MatekH743-bdshot)	19m 32s
build (chibios, Pixhawk1-1M)	16m 56s
build (chibios, MatekF405-CAN)	4m 31s
build (chibios, DrotekP3Pro)	3m 58s
build (chibios, Hitec-Airspeed)	5m 33s
build (chibios, f103-GPS)	6m 11s
build (disco, armhf)	16m 10s
	2h 6m 10s

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