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: Ic5004c42ad08b0a7f31a2716e4af067da19b6fa2
Fixes: 120706174
diff --git a/packages/SettingsLib/LayoutPreference/Android.bp b/packages/SettingsLib/LayoutPreference/Android.bp
new file mode 100644
index 0000000..a1f9a76
--- /dev/null
+++ b/packages/SettingsLib/LayoutPreference/Android.bp
@@ -0,0 +1,13 @@
+android_library {
+    name: "SettingsLibLayoutPreference",
+
+    srcs: ["src/**/*.java"],
+    resource_dirs: ["res"],
+
+    static_libs: [
+          "androidx.preference_preference",
+    ],
+
+    sdk_version: "system_current",
+    min_sdk_version: "21",
+}