payloads: change coreboot to lowercase

The word 'coreboot' should always be written in lowercase, even at the
start of a sentence.

Change-Id: I2ec18ca55e0ea672343a951ab81a24a5630f45fd
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/20028
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

payloads/coreinfo/bootlog_module.c

@@ -170,7 +170,7 @@ err_free:
 
 static int bootlog_module_redraw(WINDOW *win)
 {
-	print_module_title(win, "Coreboot Bootlog");
+	print_module_title(win, "coreboot Bootlog");
 
 	if (!g_buf) {
 		return -1;