bootstage: Replace show_boot_progress/error() with bootstage_...()

These calls should not be made directly any more, since bootstage
will call the show_boot_...() functions as needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index 37f162a..53dc4df 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -69,7 +69,7 @@
 	debug ("## Transferring control to Linux (at address %08lx) ...\n",
 		(ulong)kernel);
 
-	show_boot_progress(BOOTSTAGE_ID_RUN_OS);
+	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
 
 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
 	unlock_ram_in_cache();