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/mach-k3/r5/sysfw-loader.c b/arch/arm/mach-k3/r5/sysfw-loader.c
index 94d051b..188731e 100644
--- a/arch/arm/mach-k3/r5/sysfw-loader.c
+++ b/arch/arm/mach-k3/r5/sysfw-loader.c
@@ -451,7 +451,7 @@
 		 * the case when continuing to boot serially from the same
 		 * UART that the ROM loaded the initial bootloader from.
 		 */
-		if (!gd->have_console)
+		if (!(gd->flags & GD_FLG_HAVE_CONSOLE))
 			early_console_init();
 #endif
 		ret = spl_ymodem_load_image(&spl_image, &bootdev);