kbuild: pkg: clean up package files/dirs from the top Makefile

I am not a big fan of the $(objtree)/ hack for clean-files/clean-dirs.

These are created in the top of $(objtree), so let's clean them up
from the top Makefile.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

Makefile

@@ -1386,12 +1386,14 @@ CLEAN_FILES += modules.builtin.modinfo
 
 # Directories & files removed with 'make mrproper'
 MRPROPER_DIRS  += include/config include/generated          \
-		  arch/$(SRCARCH)/include/generated .tmp_objdiff
+		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
+		  debian/ snap/ tar-install/
 MRPROPER_FILES += .config .config.old .version \
 		  Module.symvers \
 		  signing_key.pem signing_key.priv signing_key.x509	\
 		  x509.genkey extra_certificates signing_key.x509.keyid	\
-		  signing_key.x509.signer vmlinux-gdb.py
+		  signing_key.x509.signer vmlinux-gdb.py \
+		  *.spec
 
 # Directories & files removed with 'make distclean'
 DISTCLEAN_DIRS  +=

scripts/Makefile

@@ -36,4 +36,4 @@ subdir-$(CONFIG_MODVERSIONS) += genksyms
 subdir-$(CONFIG_SECURITY_SELINUX) += selinux
 
 # Let clean descend into subdirs
-subdir-	+= basic dtc gdb kconfig mod package
+subdir-	+= basic dtc gdb kconfig mod

scripts/package/Makefile

@@ -65,8 +65,6 @@ binrpm-pkg: FORCE
 	+rpmbuild $(RPMOPTS) --define "_builddir $(objtree)" --target \
 		$(UTS_MACHINE) -bb $(objtree)/binkernel.spec
 
-clean-files += $(objtree)/*.spec
-
 deb-pkg: FORCE
 	$(MAKE) clean
 	$(CONFIG_SHELL) $(srctree)/scripts/package/mkdebian
@@ -82,8 +80,6 @@ bindeb-pkg: FORCE
 intdeb-pkg: FORCE
 	+$(CONFIG_SHELL) $(srctree)/scripts/package/builddeb
 
-clean-dirs += $(objtree)/debian/
-
 # snap-pkg
 # ---------------------------------------------------------------------------
 snap-pkg: FORCE
@@ -98,17 +94,12 @@ snap-pkg: FORCE
 	cd $(objtree)/snap && \
 	snapcraft --target-arch=$(UTS_MACHINE)
 
-clean-dirs += $(objtree)/snap/
-
 # tarball targets
 # ---------------------------------------------------------------------------
 tar%pkg: FORCE
 	$(MAKE) -f $(srctree)/Makefile
 	+$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
 
-clean-dirs += $(objtree)/tar-install/
-
-
 # perf-pkg - generate a source tarball with perf source
 # ---------------------------------------------------------------------------