bootstage: Convert net progress numbers to enums

This changes over the network-related progress numbers to use enums
from bootstage.h.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_net.c b/common/cmd_net.c
index c9f2a08..897b6f6 100644
--- a/common/cmd_net.c
+++ b/common/cmd_net.c
@@ -230,36 +230,37 @@
 		break;
 #endif
 	default:
-		show_boot_error(80);
+		show_boot_error(BOOTSTAGE_ID_NET_START);
 		return CMD_RET_USAGE;
 	}
+	show_boot_progress(BOOTSTAGE_ID_NET_START);
 
-	show_boot_progress(80);
 	if ((size = NetLoop(proto)) < 0) {
-		show_boot_error(81);
+		show_boot_error(BOOTSTAGE_ID_NET_NETLOOP_OK);
 		return 1;
 	}
+	show_boot_progress(BOOTSTAGE_ID_NET_NETLOOP_OK);
 
-	show_boot_progress(81);
 	/* NetLoop ok, update environment */
 	netboot_update_env();
 
 	/* done if no file was loaded (no errors though) */
 	if (size == 0) {
-		show_boot_error(82);
+		show_boot_error(BOOTSTAGE_ID_NET_LOADED);
 		return 0;
 	}
 
 	/* flush cache */
 	flush_cache(load_addr, size);
 
-	show_boot_progress(82);
+	show_boot_progress(BOOTSTAGE_ID_NET_LOADED);
+
 	rcode = bootm_maybe_autostart(cmdtp, argv[0]);
 
 	if (rcode < 0)
-		show_boot_error(83);
+		show_boot_error(BOOTSTAGE_ID_NET_DONE_ERR);
 	else
-		show_boot_progress(84);
+		show_boot_progress(BOOTSTAGE_ID_NET_DONE);
 	return rcode;
 }