Add SettingsSpinnerPreference

This preference uses SettingsSpinner & SettingsSpinnerAdapter
which provide default layouts for both view and drop down view
of the Spinner.

Bug: 177617478
Test: atest SettingsSpinnerPreferenceTest
Change-Id: I9ceb2db6d82692ee21b6d96af7b42c49400d5071
diff --git a/packages/SettingsLib/SettingsSpinner/Android.bp b/packages/SettingsLib/SettingsSpinner/Android.bp
index f18917c..ca23616 100644
--- a/packages/SettingsLib/SettingsSpinner/Android.bp
+++ b/packages/SettingsLib/SettingsSpinner/Android.bp
@@ -4,6 +4,10 @@
     srcs: ["src/**/*.java"],
     resource_dirs: ["res"],
 
+    static_libs: [
+        "androidx.preference_preference",
+    ],
+
     sdk_version: "system_current",
     min_sdk_version: "21",
 }