Preload newly added java.lang.Process* classes

The prefetto trace shows that there is an 1 or 2 frame
dropped during the 2-second tracing. The regression may be due to
the class initialization of the newly added classess.

Bug: 256033367
Test: m droid
Change-Id: I33e278244b5cf11aba403e3f1a131b3837accfc7