kbuild: remove redundant $(wildcard ) for rm-files

The $(wildcard ) is called in quiet_cmd_rmfiles.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <n.schier@avm.de>

Makefile

@@ -1515,7 +1515,7 @@ clean: archclean vmlinuxclean resolve_btfids_clean
 
 # mrproper - Delete all generated files, including .config
 #
-mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
+mrproper: rm-files := $(MRPROPER_FILES)
 mrproper-dirs      := $(addprefix _mrproper_,scripts)
 
 PHONY += $(mrproper-dirs) mrproper