This change ensures that bootclasspath_fragment only depends on source
modules and prebuilt_bootclasspath_fragment only depends on prebuilt
modules.
It does that in two ways:
1. It adds the dependencies in ComponentDepsMutator method which is
called before any renaming of prebuilts is done which makes it very
easy to add a dependency directly onto either the source or prebuilt
as required.
2. It uses a tag which prevents dependencies on a source module from
being replaced with a dependency on a prebuilt module which ensures
that a dependency on the source modules is not replaced with a
dependency on a prebuilt module.
Bug: 177892522
Test: m nothing
Change-Id: Ibcfae39083afbc07fcf729ead3ed5f5d020845bf
6589805e2a