cfg80211: don't print log output for building shipped-certs

Building an allmodconfig kernel with 'make -s' now prints a single line:

  GEN     net/wireless/shipped-certs.c

Using '$(kecho)' here will skip the output with 'make -s' but
otherwise keeps printing it, which is consistent with how we
handle all the other output.

Fixes: 90a53e4432b1 ("cfg80211: implement regdb signature checking")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/Makefile

@@ -23,7 +23,7 @@ cfg80211-y += extra-certs.o
 endif
 
 $(obj)/shipped-certs.c: $(wildcard $(srctree)/$(src)/certs/*.x509)
-	@echo "  GEN     $@"
+	@$(kecho) "  GEN     $@"
 	@echo '#include "reg.h"' > $@
 	@echo 'const u8 shipped_regdb_certs[] = {' >> $@
 	@for f in $^ ; do hexdump -v -e '1/1 "0x%.2x," "\n"' < $$f >> $@ ; done
@@ -32,7 +32,7 @@ $(obj)/shipped-certs.c: $(wildcard $(srctree)/$(src)/certs/*.x509)
 
 $(obj)/extra-certs.c: $(CONFIG_CFG80211_EXTRA_REGDB_KEYDIR:"%"=%) \
 		      $(wildcard $(CONFIG_CFG80211_EXTRA_REGDB_KEYDIR:"%"=%)/*.x509)
-	@echo "  GEN     $@"
+	@$(kecho) "  GEN     $@"
 	@echo '#include "reg.h"' > $@
 	@echo 'const u8 extra_regdb_certs[] = {' >> $@
 	@for f in $^ ; do test -f $$f && hexdump -v -e '1/1 "0x%.2x," "\n"' < $$f >> $@ || true ; done