wifi: Add new HAL API: getBridgedInstances

Also fix the instances doesn't update after removing the instance

Cherry-pick from ag/13382534 which finished the review in master branch

Bug: 173999527
Test: atest -c VtsHalWifiApV1_5TargetTest

Change-Id: I439922d38c35b5367823f95f5f7d0e4c6ed05f57
6 files changed