soc/amd/stoneyridge: start header file for iomap

Create a new header file, iomap.h, which serves as a single
place for providing the address space definitions. Remove
the amd_defs.h file that had a single define in it.

Change-Id: I1b1aaa8c5d60d670c272ac7131faeb6b3edc1968
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/22318
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/include/soc/gpio.h

@@ -20,7 +20,7 @@
 #define GPIO_DEVICE_DESC	"GPIO Controller"
 
 #ifndef __ACPI__
-#include <soc/amd/common/amd_defs.h>
+#include <soc/iomap.h>
 #include <types.h>
 
 #define GPIO_PIN_STS		(1 << 16)

src/soc/amd/stoneyridge/include/soc/iomap.h

@@ -2,6 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright (C) 2017 Raptor Engineering, LLC
+ * Copyright 2017 Google Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -13,10 +14,9 @@
  * GNU General Public License for more details.
  */
 
-
-#ifndef __AMD_SB_DEFS_H__
-#define __AMD_SB_DEFS_H__
+#ifndef __SOC_STONEYRIDGE_IOMAP_H__
+#define __SOC_STONEYRIDGE_IOMAP_H__
 
 #define AMD_SB_ACPI_MMIO_ADDR 0xfed80000ul
 
-#endif
+#endif /* __SOC_STONEYRIDGE_IOMAP_H__ */