Make Typeface.create thread safe.

Typeface.create has not been thread-safe. This CL makes it thread safe.
At the same time, reorganize cache and lock in Typeface.

Bug: 64606109
Test: bit FrameworksCoreTests:android.graphics.TypefaceTest
Test: bit CtsGraphicsTestCases:android.graphics.cts.TypefaceTest
Change-Id: Id18e9b8bfab508a26fc0c83af6b1ca97e132b732