Apply the Nullability Annotations linter to the SettingsLib

Fixes: 319351140
Test: compilation
Change-Id: Ia9573ec215046fa4fe940ef0538f9bfe3d469b45
diff --git a/packages/SettingsLib/DisplayUtils/Android.bp b/packages/SettingsLib/DisplayUtils/Android.bp
index eab35a1..279bb70 100644
--- a/packages/SettingsLib/DisplayUtils/Android.bp
+++ b/packages/SettingsLib/DisplayUtils/Android.bp
@@ -10,6 +10,9 @@
 android_library {
     name: "SettingsLibDisplayUtils",
     use_resource_processor: true,
+    defaults: [
+        "SettingsLintDefaults",
+    ],
 
     srcs: ["src/**/*.java"],