Fix drag and drop may stuck in multi touch am: 54745651

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/17822681



Change-Id: I3a2a4c927032a0dec218e8d174f4b671be67a4bf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>