Fixes @Nullable issues SystemUI-tests

Test: builds
Bug: 294098415
Change-Id: I258629e15004bf5cca37e5544727c92551a10a78
diff --git a/packages/SystemUI/Android.bp b/packages/SystemUI/Android.bp
index 851f976..07f7ecd 100644
--- a/packages/SystemUI/Android.bp
+++ b/packages/SystemUI/Android.bp
@@ -409,6 +409,7 @@
         "mockito-target-extended-minus-junit4",
         "androidx.test.ext.junit",
         "androidx.test.ext.truth",
+        "kotlin-test",
     ],
     libs: [
         "android.test.runner",