Expand more buttons for ActionButtonPreference

Old design, we only need two action buttons in Settings app.
In the future, we need four buttons for some use cases.

Test: visual, robotest
Bug: 120005054
Change-Id: I859fee8d7167ce59222059cc441e4a3c167c7b34

tests/robotests/src/com/android/settings/bluetooth/BluetoothDetailsButtonsControllerTest.java

@@ -55,7 +55,8 @@ public class BluetoothDetailsButtonsControllerTest extends BluetoothDetailsContr
     public void setUp() {
         super.setUp();
         final View buttons = View.inflate(
-                RuntimeEnvironment.application, R.layout.two_action_buttons, null /* parent */);
+                RuntimeEnvironment.application, R.layout.settings_action_buttons,
+                null /* parent */);
         mConnectButton = buttons.findViewById(R.id.button2);
         mForgetButton = buttons.findViewById(R.id.button1);
         mController =