dm: blk: Drop the systemace.h header

This has nothing of consequence. Remove it and its only inclusion site.
Signed-off-by: NSimon Glass <sjg@chromium.org>

drivers/block/systemace.c

@@ -27,7 +27,6 @@
 
 #include <common.h>
 #include <command.h>
-#include <systemace.h>
 #include <part.h>
 #include <asm/io.h>
 

include/systemace.h

-#ifndef __SYSTEMACE_H
-#define __SYSTEMACE_H
-/*
- * Copyright (c) 2004 Picture Elements, Inc.
- *    Stephen Williams (steve@picturel.com)
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#endif	/* __SYSTEMACE_H */