Factor out HelpUtils into @SystemAPI lib

This is the first of a few sub-libraries that will get factored out of
the settings lib. These libs will be included by mainline modules which
are compiles against system-api.

Bug: 110953302
Test: Looked at UI
      m -j RunRoboSettingsLibTests
Change-Id: I16347e565aca554d6a8653df35765c2194479e78
diff --git a/packages/SettingsLib/Android.bp b/packages/SettingsLib/Android.bp
index 4791517..57767e9 100644
--- a/packages/SettingsLib/Android.bp
+++ b/packages/SettingsLib/Android.bp
@@ -11,6 +11,10 @@
         "androidx.lifecycle_lifecycle-runtime",
     ],
 
+    static_libs: [
+        "SettingsLibHelpUtils",
+    ],
+
     // ANDROIDMK TRANSLATION ERROR: unsupported assignment to LOCAL_SHARED_JAVA_LIBRARIES
     // LOCAL_SHARED_JAVA_LIBRARIES := androidx.lifecycle_lifecycle-common