kbuild: deb-pkg: add pkg.linux-upstream.nokerneldbg build profile

The Debian kernel supports the pkg.linux.nokerneldbg build profile.

The debug package tends to become huge, and you may not want to build
it even when CONFIG_DEBUG_INFO is enabled.

This commit introduces a similar profile for the upstream kernel.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>