Fix testCallback fail caused by lacking of looper am: 324bd00c3e

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2016000

Change-Id: I3addc413c6e783ab72d881d9e2350a9316bdfc18
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>