Fix proguard flags for settings.

Bug: 2933151
diff --git a/proguard.flags b/proguard.flags
index d37d2e0..771be59 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -1,2 +1,5 @@
 # Keep all Fragments in this package, which are used by reflection.
 -keep class com.android.settings.*Fragment
+-keep class com.android.settings.*Settings
+-keep class com.android.settings.deviceinfo.*
+