bootstage: call show_boot_progress also in SPL

show_boot_progress() is now called from SPL also.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/common/init/board_init.c b/common/init/board_init.c
index d17bb29..ef01a9a 100644
--- a/common/init/board_init.c
+++ b/common/init/board_init.c
@@ -146,3 +146,8 @@
 	base += CONFIG_SYS_MALLOC_F_LEN;
 #endif
 }
+
+/*
+ * Board-specific Platform code can reimplement show_boot_progress () if needed
+ */
+__weak void show_boot_progress(int val) {}