UBUNTU: [Packaging] clean up the distclean rule

debian/control appears twice. Remove the second one

$(DEBIAN)/control.stub is created during 'debian/rules clean', but
debian/control.stub is never created.

Signed-off-by: Masahiro Yamada <masahiro.yamada@canonical.com>
Acked-by: Stewart Hore <stewart.hore@canonical.com>
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>

Author: masahir0y

debian/rules

@@ -153,8 +153,7 @@ clean: debian/control debian/canonical-certs.pem debian/canonical-revoked-certs.
 
 .PHONY: distclean
 distclean: clean
-	rm -rf debian/control debian/changelog \
-		debian/control debian/control.stub debian/copyright
+	rm -rf debian/control debian/changelog debian/copyright
 
 # Builds the image, arch headers and debug packages
 include debian/rules.d/2-binary-arch.mk