global_data: Convert have_console into a flag

We don't need a full word for this boolean value. Convert it into a flag
to save space in global_data.

Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
index 76a69d7..dd74832 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_boot.c
@@ -117,7 +117,7 @@
 	gd->bd = &bdata;
 	gd->baudrate = CONFIG_BAUDRATE;
 	serial_init();
-	gd->have_console = 1;
+	gd->flags |= GD_FLG_HAVE_CONSOLE;
 #endif
 }