lib/oe/sstate: Add tasks_resolved handler for virtual/xxx mappings

lib/oe/sstate: Add tasks_resolved handler for virtual/xxx mappings

In SIGGEN_EXCLUDERECIPES_ABISAFE and SIGGEN_EXCLUDE_SAFE_RECIPE_DEP
we really need to be able to use virtual/xxx namespaces but this
currently doesn't work.

To make this work, we need to translate them into the resolved
providers. After such a hook was added to bitbake, we can add
this translation here.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>