SysuiTestCase mocks gantry FeatureFlags

Fixes: 303835341
Test: atest SystemUITests
Change-Id: Iaf4373357ced6e87c71bec350bdb0e5af738769f
diff --git a/packages/SystemUI/Android.bp b/packages/SystemUI/Android.bp
index e40fcb2..00e1f1c 100644
--- a/packages/SystemUI/Android.bp
+++ b/packages/SystemUI/Android.bp
@@ -435,6 +435,7 @@
         "SystemUI-statsd",
         "SettingsLib",
         "com_android_systemui_flags_lib",
+        "flag-junit-base",
         "androidx.viewpager2_viewpager2",
         "androidx.legacy_legacy-support-v4",
         "androidx.recyclerview_recyclerview",