Makefile: Adjust indention of GENENV quiet output

The column width for a command name is 8.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
diff --git a/Makefile b/Makefile
index a73481d..71cf6f7 100644
--- a/Makefile
+++ b/Makefile
@@ -2279,7 +2279,7 @@
 	$(build)=$(build-dir) $(@:.ko=.o)
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
-quiet_cmd_genenv = GENENV $@
+quiet_cmd_genenv = GENENV  $@
 cmd_genenv = $(OBJCOPY) --dump-section .rodata.default_environment=$@ env/common.o; \
 	sed --in-place -e 's/\x00/\x0A/g' $@