Use dh_listpackages to get a list of all binary packages.
With this, debian/control lists which binary packages will be produced.
Previously, ARCH=um listed linux-libc-dev in debian/control, but it
was not generated because each of mkdebian and builddeb independently
maintained the if-conditionals.
Another motivation is to allow scripts/package/builddeb to get the
package name (linux-image-*, etc.) dynamically from debian/control.
This will also allow the BuildProfile to control the generation of
the binary packages.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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