bootstage: Convert progress numbers 20-41 to enums

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/pcs440ep/pcs440ep.c b/board/pcs440ep/pcs440ep.c
index 118d81c..f67eedd 100644
--- a/board/pcs440ep/pcs440ep.c
+++ b/board/pcs440ep/pcs440ep.c
@@ -97,7 +97,8 @@
 void show_boot_progress (int val)
 {
 	/* find all valid Codes for val in README */
-	if (val == -30) return;
+	if (val == -BOOTSTAGE_ID_NEED_RESET)
+		return;
 	if (val < 0) {
 		/* smthing goes wrong */
 		status_led_blink ();