Add multiuser CTS to SystemUI TEST_MAPPING

Bug: 372712206
Test: N/A
Flag: TEST_ONLY

Change-Id: If2ce76281dc45a11dfd0a4d501841b8cb844dc04
diff --git a/packages/SystemUI/TEST_MAPPING b/packages/SystemUI/TEST_MAPPING
index 07a1e63..380344a 100644
--- a/packages/SystemUI/TEST_MAPPING
+++ b/packages/SystemUI/TEST_MAPPING
@@ -148,5 +148,10 @@
     {
       "name": "SystemUIGoogleRobo2RNGTests"
     }
+  ],
+  "imports": [
+    {
+      "path": "cts/tests/tests/multiuser"
+    }
   ]
 }