timer: add overflow handler API
Created by: Joe-Zhucg
Some device need interrupt to update internal status. Add new driver API to do this if there is no acitve alarm.
Change-Id: I6a3106beb8dce8de7de29dfa5ff5742a9fd9692b
Edited by Darryl Green
Created by: Joe-Zhucg
Some device need interrupt to update internal status. Add new driver API to do this if there is no acitve alarm.
Change-Id: I6a3106beb8dce8de7de29dfa5ff5742a9fd9692b