Get current tracked BSSID from Layer2Info on starting provisioning. am: 861fe42cc8 am: a3ae54bcb2 am: a4f390ac19

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1675596

Change-Id: Ie961774a8941a87849a6a6f241356906030ac64c