Fixing test cases failed at low ram device

The activity could not be launched at non-default display if this
device is a low ram device. So adding the checking condition of
supporting multi-display at these test cases skips these tests
that need to launch activity on second display at a low ram device.

Bug: 159300053
Test: atest AccessibilityWindowReportingTest
Test: atest AccessibilityWindowQueryTest
Test: atest AccessibilityEmbeddedDisplayTest
Change-Id: I0addf819b1fe052b7699871ef8bbd68673a44505
4 files changed