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: Ic043b9b3cdfaa53e5d149aca519c6c41e632845c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>