microsecond-timer: stop when core is stopped by debuger #1660

Job	Run time
generate-matrix	11s
build-libopenblt-linux	1m 9s
release	8s
build-firmware (uaefi_pro_h7, config/boards/hellen/uaefi/meta-info-uaefi_pro_h7.env)	4m 51s
	6m 19s

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