Merge "Add IFF_MULTICAST to test interfaces" am: aa5532cb6f am: e90ceefb34 am: c25fd004f7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1856105

Change-Id: Ifd52cb71a9c315fa80ce3f5a8ae865bb2ce842fc