samsung:  doze: Integrate with Settings

Bring this up to speed on the Settings changes in N:
 * Use support libs for preferences
 * Hook up to Settings drawer through SettingsDrawerActivity

Change-Id: I9365b3ebd1bbfed2936302e30da50e3f9af06665
diff --git a/doze/proguard.flags b/doze/proguard.flags
index 3bb1f2c..0a62941 100644
--- a/doze/proguard.flags
+++ b/doze/proguard.flags
@@ -1,3 +1,9 @@
 -keep class com.cyanogenmod.settings.device.* {
   *;
 }
+
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet);
+}
+
+-keep class ** extends android.support.v14.preference.PreferenceFragment