sys/ztimer/kconfig: enable xtimer compat only with timer backend #17307
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Contribution description
While testing #17235 I came across a discrepancy between when
Makefile.dep
enables xtimer compatibility modules and when Kconfig does it. Kconfig would enable compatibility whenever xtimer and ztimer are active, butMakefile.dep
checks in addition that the timer peripheral backend is enabled. This PR adds this condition to the Kconfig choice. To avoid a loop on the selection of MODULE_ZTIMER_PERIPH_TIMER, this also moves its selection from MODULE_ZTIMER_USEC to the visible symbol ZTIMER_USEC.Testing procedure
Makefile.dep
.Issues/PRs references
#17235