Use application context getting secondary displays.

Activity contexts include override configurations in their resources
associated with the primary display. There currently is no way to
specify overrides for another display from the same context. As a
result, getting metrics for other displays will reflect the metrics
of the context's display.

This change provides the application context when we create a display
if the display id does not match the display associated with the
context.

Change-Id: I68a7b609ead6d7cc652d36e7e8af432700af8efa
Fixes:37923030
Test: cts-tradefed run cts-dev --module CtsDisplayTestCases --test android.display.cts.DisplayTest#testActivityContextGetMetrics