Add test mapping for a11y

Also marking a few tests as flaky and fixing a couple
others.

Test: atest in:
frameworks/base/services/accessibility
frameworks/base/core/java/android/accessibilityservice
frameworks/base/core/java/android/view.accessibility

Change-Id: I217329655105ce3fa8d78e74c4d39aadcfcd8362
7 files changed