Add subfamilly distinction to ARMV7M family #753

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 33s
call-ci / build (armv7a9-zynq7000-qemu)	1m 35s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 24s
call-ci / build (armv7a9-zynq7000-zturn)	1m 38s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 13s
call-ci / build (armv7m7-imxrt106x-evk)	1m 43s
call-ci / build (armv7m7-imxrt117x-evk)	1m 37s
call-ci / build (host-generic-pc)	58s
call-ci / build (ia32-generic-pc)	1m 23s
call-ci / build (ia32-generic-qemu)	1m 15s
call-ci / build (riscv64-generic-qemu)	1m 23s
call-ci / build (riscv64-generic-spike)	1m 26s
call-ci / run tests on emulators (armv7a9-zynq7000-qemu)	5m 35s
call-ci / run tests on emulators (host-generic-pc)	1m 7s
call-ci / run tests on emulators (ia32-generic-qemu)	3m 40s
call-ci / run tests on hardware (armv7m7-imxrt106x-evk)	1m 49s
call-ci / run tests on hardware (armv7m7-imxrt117x-evk)	2m 9s
call-ci / run tests on hardware (armv7a9-zynq7000-zedboard)	4m 6s
call-ci / run tests on hardware (armv7m4-stm32l4x6-nucleo)	8m 34s
call-ci / notify ci team using e-mail	0s
	44m 8s

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