samsung: doze: Clean up proguard flags

Change-Id: If0250fb629417d36c2af7286bc0620e682c4576e
diff --git a/doze/proguard.flags b/doze/proguard.flags
index 37c5c91..f6d7a5b 100644
--- a/doze/proguard.flags
+++ b/doze/proguard.flags
@@ -1,9 +1,3 @@
 -keep class org.lineageos.settings.doze.* {
   *;
 }
-
--keepclasseswithmembers class * {
-    public <init>(android.content.Context, android.util.AttributeSet);
-}
-
--keep class ** extends android.support.v14.preference.PreferenceFragment