x86: edison: Drop inclusion of ibmpc.h

This should be included by files that need it, not the config.h file.
Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> # Intel Edison
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/configs/edison.h b/include/configs/edison.h
index 558c74d..127c2c4 100644
--- a/include/configs/edison.h
+++ b/include/configs/edison.h
@@ -2,10 +2,3 @@
 /*
  * Copyright (c) 2017 Intel Corp.
  */
-
-#ifndef __CONFIG_H
-#define __CONFIG_H
-
-#include <asm/ibmpc.h>
-
-#endif