[PATCH] powerpc: Update broken clean & mrproper

commit cc8a51ca6f05 ("kbuild: always create directories of targets") breaks
mrproper on ppc. arch/powerpc/boot/arch/ is not cleaned up when running
mrproper. Before this patch:

$ make ARCH=powerpc
$ make ARCH=powerpc mrproper
$ git clean -ndxf
Would remove arch/powerpc/boot/arch

After this patch, the directory reported by git clean is no longer
reported.

Fixes: cc8a51ca6f05 ("kbuild: always create directories of targets")
Signed-off-by: Andrew Delgadillo <redacted>
---
 arch/powerpc/boot/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 2b8da923ceca..3cc762cce1a4 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile

@@ -454,7 +454,7 @@ PHONY += install zInstall
 clean-files += $(image-) $(initrd-) cuImage.* dtbImage.* treeImage.* \
 	zImage zImage.initrd zImage.chrp zImage.coff zImage.holly \
 	zImage.miboot zImage.pmac zImage.pseries \
-	zImage.maple simpleImage.* otheros.bld
+	zImage.maple simpleImage.* otheros.bld arch
 
 # clean up files cached by wrapper
 clean-kernel-base := vmlinux.strip vmlinux.bin

-- 
2.30.0.280.ga3ce27912f-goog