[posix-app] update timer implementation to handle speedup (#3045)
[posix-app] update timer implementation to handle speedup (#3045)


lanyuwen/openthread,openthread/openthread,erja-gp/openthread,librasungirl/openthread,gandreello/openthread,LeZhang2016/openthread,lanyuwen/openthread,bukepo/openthread,erja-gp/openthread,srickardti/openthread,jwhui/openthread,srickardti/openthread,bukepo/openthread,abtink/openthread,chshu/openthread,erja-gp/openthread,gandreello/openthread,turon/openthread,abtink/openthread,chshu/openthread,gandreello/openthread,erja-gp/openthread,jwhui/openthread,chshu/openthread,bukepo/openthread,turon/openthread,lanyuwen/openthread,lanyuwen/openthread,LeZhang2016/openthread,chshu/openthread,jwhui/openthread,turon/openthread,librasungirl/openthread,openthread/openthread,openthread/openthread,gandreello/openthread,lanyuwen/openthread,srickardti/openthread,lanyuwen/openthread,LeZhang2016/openthread,chshu/openthread,jwhui/openthread,librasungirl/openthread,LeZhang2016/openthread,erja-gp/openthread,bukepo/openthread,erja-gp/openthread,turon/openthread,gandreello/openthread,gandreello/openthread,abtink/openthread,chshu/openthread,librasungirl/openthread,abtink/openthread,openthread/openthread,LeZhang2016/openthread,LeZhang2016/openthread,srickardti/openthread