go-dep: Remove

go-dep: Remove

go-dep was an effort for dependency management before go modules, which
since 2020 has been deprecated in favor of go modules. Since its not
developed any longer and go mdules is officially supported, this should
be retired from OE-core as well.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Otavio Salvador <otavio.salvador@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>