Refine sleep length in AccessibilityEventTest

In View, some accessibility event is throttled using a value from
ViewConfiguration.getSendRecurringAccessibilityEventsInterval().

This change adjusts the sleep length in the corresponding tests to
deflake them.

Bug: 217097407
Bug: 215792992
Test: android.view.accessibility.cts.AccessibilityEventTest
Change-Id: If0fca1c8c5d27088822082a8c723a30eddd867b4
1 file changed