AP_HAL_ChibiOS: NFC refactor of dshot/bdshot in preparation for bdshot on iomcu #32491

Job	Run time
build (stm32f7, chibios, 10)	7m 3s
build (stm32h7, chibios, 10)	5m 24s
build (fmuv2-plane, chibios, 10)	3m 19s
build (periph-build, chibios, 10)	8m 24s
build (iofirmware, chibios, 10)	2m 6s
build (CubeOrange-bootloader, chibios, 10)	1m 1s
build (fmuv3-bootloader, chibios, 10)	1m 22s
build (revo-bootloader, chibios, 10)	1m 17s
build (stm32h7-debug, chibios, 10)	3m 30s
build (fmuv3, chibios, 10)	6m 57s
build (revo-mini, chibios, 10)	5m 31s
build (MatekF405-Wing, chibios, 10)	6m 12s
build (CubeOrange-ODID, chibios, 10)	3m 52s
build (CubeRedPrimary-bootloader, chibios, 10)	1m 4s
build (configure-all, chibios, 10)	10m 38s
build (build-options-defaults-test, chibios, 10)	8m 48s
build (signing, chibios, 10)	3m 45s
	1h 20m 13s

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