javalib.jar -> classes.jar for the stubs included in SDK

I6730e2d3ec38004874265b2a690442dec57b33f4 made it clear that we should
depend on classes.jar for static java libraries. However, due to the
existing references to javalib.jar, the build system has been copied
classes.jar to javalib.jar.

But, this is not the case for Soong-defined java libraries. Instead of
doing the same thing for Soong-defined modules, directly fixing the
case where javalib.jar is being referenced.

Test: m -j dist

Change-Id: Iabd04ba55411373c228ca4bf04fc99b7f155262c