Driver selection from MCU define #39

Job	Run time
unit-test	38s
build-arm (broadcom_32bit)	34s
build-arm (imxrt)	3m 30s
build-arm (lpc15)	48s
build-arm (lpc18)	1m 12s
build-arm (lpc54)	1m 23s
build-arm (lpc55)	2m 15s
build-arm (mm32)	58s
build-board (device/audio_test device/board_test device/cdc_dual_ports device/cdc_msc)	47s
build-arm (msp432e4)	1m 8s
build-board (device/cdc_msc_freertos device/dfu_runtime device/hid_composite device/hid_composite...	16s
build-arm (nrf)	4m 37s
build-arm (rp2040)	5m 58s
build-board (device/hid_generic_inout device/hid_multiple_interface device/midi_test device/msc_d...	19s
build-arm (samd11)	1m 42s
build-board (device/net_lwip_webserver)	19s
build-arm (samd21)	9m 39s
build-board (device/uac2_headset device/usbtmc device/webusb_serial host/cdc_msc_hid)	24s
build-arm (samd51)	10m 8s
build-arm (saml2x)	7m 12s
build-arm (stm32f0)	1m 53s
build-arm (stm32f1)	1m 28s
build-arm (stm32f4)	4m 21s
build-arm (stm32f7)	3m 13s
build-arm (stm32h7)	2m 43s
build-arm (stm32l4)	2m 5s
build-arm (tm4c123)	49s
build-arm (xmc4000)	54s
	1h 11m 13s

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