wifi: Support interface disable event in hostapd

Fork from ag/17725527. There is a case which the frameworks would
remove interface in the bridged mode. The hostapd should monitor
interface status and report to the framework for aligning the status.

Bug: 207055799
Test: manual test via "adb shell cmd wifi remove-softap-instance"
Change-Id: Id29648abbb5219464ea6c5f3b19ca9360a1531cd
1 file changed