Makefile.inc: Notify about updating submodules

There is no longer any information printed when updating submodules, so
on the initial build, this can lead to a long delay without explaining
what's going on.
Just add an information line that the submodules are being updated so
that the user can see what's happening.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I987e50b99e39b976bc8367525549153e1eba69cd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65322
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
diff --git a/Makefile.inc b/Makefile.inc
index 91c32ff..e76d890 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -191,6 +191,7 @@
 ramstage-c-ccopts += -fprofile-arcs -ftest-coverage
 endif
 ifneq ($(UPDATED_SUBMODULES),1)
+$(info Updating git submodules.)
 # try to fetch non-optional submodules if the source is under git
 forgetthis:=$(if $(GIT),$(shell git submodule update --init $(quiet_errors)))
 # Checkout Cmocka repository