Add back legacy layout for preference framework for compatibility.

Bug: 3184831

Copied holo layouts to *_holo.xml and restored the old layouts for
non-holo (pre-honeycomb) apps to use so that their layout assumptions
aren't messed up.

Change-Id: If4dcef16191a47a4b101da6bfb0c2df1757d1ae4
diff --git a/core/java/android/preference/Preference.java b/core/java/android/preference/Preference.java
index e869f3f..7d37e5b 100644
--- a/core/java/android/preference/Preference.java
+++ b/core/java/android/preference/Preference.java
@@ -285,7 +285,7 @@
      * @see #Preference(Context, AttributeSet, int)
      */
     public Preference(Context context, AttributeSet attrs) {
-        this(context, attrs, 0);
+        this(context, attrs, com.android.internal.R.attr.preferenceStyle);
     }
 
     /**