Lower severity for invalid accessibility hover event stream to ERROR. am: 2f99cdb915 am: b63e604fd2

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

Change-Id: I0f9046d363648cc203337253588baf26505c65ef
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>