Add the log for new supported accessibility button type 'Accessibility Gesture'

* Logs the atom AccessibilityShortcutReported in westworld

Bug: 189860801
Bug: 190563948
Test: make statsd_testdrive && statsd_testdrive 266
Change-Id: I2aba7169fef8f7ce3e499a6ae2129195b91ffa4e