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

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



Change-Id: I137fe6b3498071af7d012ffbcc12e3d5850832e4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>