Makefile: enable checking of hash spacing in check-package

Now that all hash files have been fixed, enable checking of hash
spacing in check-package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Makefile

@@ -1253,7 +1253,7 @@ check-flake8:
 
 check-package:
 	find $(TOPDIR) -type f \( -name '*.mk' -o -name '*.hash' -o -name 'Config.*' -o -name '*.patch' \) \
-		-exec ./utils/check-package --exclude=Sob --exclude=HashSpaces {} +
+		-exec ./utils/check-package --exclude=Sob {} +
 
 include docs/manual/manual.mk
 -include $(foreach dir,$(BR2_EXTERNAL_DIRS),$(sort $(wildcard $(dir)/docs/*/*.mk)))