cortex-m-rt CI

Use correct cfg for `cm7` feature #346

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Run time

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Job	Run time
rt-ci-linux (nightly)	33m 51s
rt-ci-linux (stable)	29m 23s
rt-ci-linux (1.60.0)	41m 3s
rt-ci-other-os (macOS-latest)	1m 8s
rt-ci-other-os (windows-latest)	1m 13s
	1h 46m 38s