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/board/matrix_vision/mvbc_p/mvbc_p.c b/board/matrix_vision/mvbc_p/mvbc_p.c
index 4392176..9dffedc 100644
--- a/board/matrix_vision/mvbc_p/mvbc_p.c
+++ b/board/matrix_vision/mvbc_p/mvbc_p.c
@@ -250,7 +250,7 @@
 	case 12:
 		setbits_be32(&gpio->simple_dvo, LED_Y);
 		break;
-	case 15:
+	case BOOTSTAGE_ID_RUN_OS:
 		setbits_be32(&gpio->simple_dvo, LED_R);
 		break;
 	default: