Re-added intdef annotation processor plugin

Re-added plugin of intdefs annotation processor. The plugin was
added to a different target (`framework-minus-apex-intdefs`)
because of the refactoring of the `framework-all` target.

Generated files and command to properly merge them can be found at
go/winscope-help.

Test: run 'mp :framework-minus-apex-intdefs' and check if mapping files are properly generated
Change-Id: I295c85504246a85dea968ed26f8c05747ff5a7f7