Allow TOUCHSCREEN event observing while TouchExploration is enabled. am: 306dc39d62

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/29006683

Change-Id: I441d136e1b9a763009a8eaf0478e1fbc8210af12
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>