common: board_r: Drop initr_post_backlog wrapper

Add a return value to post_output_backlog and use it directly in the
post-relocation init sequence, rather than using a wrapper stub.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

post/post.c

@@ -128,7 +128,7 @@ static void post_log_mark_succ(unsigned long testid)
 }
 
 /* ... and the messages are output once we are relocated */
-void post_output_backlog(void)
+int post_output_backlog(void)
 {
 	int j;
 
@@ -143,6 +143,8 @@ void post_output_backlog(void)
 			}
 		}
 	}
+
+	return 0;
 }
 
 static void post_bootmode_test_on(unsigned int last_test)