[BugFix][API-1450]clear dnsmasq lease info when sta device disconnect

Affected branch:MR3.0-xx && GSW3.0

Affected module:wifi

Is it addected on both ZXIC and MTK: only MTK

Self-test: Yes

Doc Update: No

Change-Id: I3cc34ad4f85dcfb495b7fdb22634d98c9bda9962
1 file changed