bootstage: Make use of BOOTSTAGE_ID_RUN_OS in show_boot_progress()

This changes the number 15 as used in boot_stage_progress() to use the
new name provided for it. This is a separate patch because it touches
so many files.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index afa0093..249ac1b 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -113,7 +113,7 @@
 		printf ("Using machid 0x%x from environment\n", machid);
 	}
 
-	show_boot_progress (15);
+	show_boot_progress(BOOTSTAGE_ID_RUN_OS);
 
 #ifdef CONFIG_OF_LIBFDT
 	if (images->ft_len)