Lower severity for invalid accessibility hover event stream to ERROR. am: 2f99cdb9 am: 426b91b7

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/24300485



Change-Id: I6a8eabb8a6567374f30208863448f6074bae0489
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>