Make java binaries common instead of common-first

Previously, java binaries had both common and the first arch variants.
This was origionally added in aosp/556843. The reasoning there was so
that a java binary could be used as the dependency of a genrule.

However, now with transition mutators, we can make the incoming
transition redirect the arch variant to the common variant if the module
only has a common variant. This allows genrules to depend on the common
arch variant easily. That change is also included in this cl.

Bug: 372091092
Test: m nothing --no-skip-soong-tests
Change-Id: Iea612d050bff608d661f81566884653239015213