Allow first power mode as off state

Bug: 237745199
test: atest libsurfaceflinger_unittest:OnInitializeDisplaysTest
      atest libsurfaceflinger_unittest:SetPowerModeInternalTest
Change-Id: I3a2eae4efc4a5c6113700a9ca9e9b261e364a878
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
index 42585b5..6c6c9aa 100644
--- a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -728,6 +728,7 @@
                 mHwcDisplayId(hwcDisplayId) {
             mCreationArgs.connectionType = connectionType;
             mCreationArgs.isPrimary = isPrimary;
+            mCreationArgs.initialPowerMode = hal::PowerMode::ON;
         }
 
         sp<IBinder> token() const { return mDisplayToken; }