Rename two targets to have SettingsLib prefix

- Rename lib name of ActionButtonsPreference and LayoutPreference.
- Remove Settings* prefix for directory name of LayoutPreference.
The LayoutPreference is in settingslib so it's pretty clear
it's a settings widget.

Test: Rebuild SettingsLib and robotest Settings
Change-Id: Ief827067dec85bb5b3ce07d97723c0323aece294
Fixes: 120706174
diff --git a/packages/SettingsLib/ActionButtonsPreference/Android.bp b/packages/SettingsLib/ActionButtonsPreference/Android.bp
index e518e0b..cd3fb0c 100644
--- a/packages/SettingsLib/ActionButtonsPreference/Android.bp
+++ b/packages/SettingsLib/ActionButtonsPreference/Android.bp
@@ -1,5 +1,5 @@
 android_library {
-    name: "ActionButtonsPreference",
+    name: "SettingsLibActionButtonsPreference",
 
     srcs: ["src/**/*.java"],
     resource_dirs: ["res"],