Apply new settings widget lib for cbr roaming feature support

Bug: 198618350
Test: make, manual
Change-Id: Id7d7bf9303a924b29ed8fe422daafea3ef391cd5
diff --git a/packages/SettingsLib/TopIntroPreference/Android.bp b/packages/SettingsLib/TopIntroPreference/Android.bp
index 9577281..cd0bdea 100644
--- a/packages/SettingsLib/TopIntroPreference/Android.bp
+++ b/packages/SettingsLib/TopIntroPreference/Android.bp
@@ -19,4 +19,8 @@
     ],
     sdk_version: "system_current",
     min_sdk_version: "21",
+    apex_available: [
+        "//apex_available:platform",
+        "com.android.cellbroadcast",
+    ],
 }