[csl] add check for `TimerMicro` when CSL RX is enabled (#6861)
[csl] add check for `TimerMicro` when CSL RX is enabled (#6861)


abtink/openthread,openthread/openthread,abtink/openthread,jwhui/openthread,abtink/openthread,openthread/openthread,jwhui/openthread,srickardti/openthread,abtink/openthread,jwhui/openthread,jwhui/openthread,srickardti/openthread,srickardti/openthread,srickardti/openthread,openthread/openthread,openthread/openthread