Prevent access for Typeface.setDefault

Developers can use font in xml and also application global theme in
order to change the default Typeface. android:textViewStyle and its 
attribute android:textAppearance can be used to change typeface and 
other text related properties.

Test: None
Bug: 123769410
Change-Id: I5923da9c7a31a5da0466fd864dd37100d896e2b0