Allow for SDK 26 Activities to specify orientation when not fullscreen.

Change-Id: I9137a7ba7593dcd6031e1fcbcd6dcc0a287d707b
Fixes: 38221413
Test: cts/hostsidetests/services/activityandwindowmanager/util/run-test CtsServicesHostTestCases android.server.cts.ActivityManagerAppConfigurationTests#testNonfullscreenAppOrientationRequests
Test: cts/hostsidetests/services/activityandwindowmanager/util/run-test CtsServicesHostTestCases android.server.cts.ActivityManagerAppConfigurationTests#testLegacyNonFullscreenActivityPermitted