builddeb: clean generated package content

builddeb: clean generated package content

BugLink: https://bugs.launchpad.net/bugs/2011425
[ Upstream commit c9f9cf2560e40b62015c6c4a04be60f55ce5240e ]

For each binary Debian package, a directory with the package name is
created in the debian directory. Correct the generated file matches in the
package's clean target, which were renamed without adjusting the target.

Fixes: 1694e94e4f46 ("builddeb: match temporary directory name to the package name")
Signed-off-by: Bastian Germann <bage@linutronix.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>