AMD based boards: platform_cfg.h: Replace `_*BOARDNAME*_CFG_H_` with `_PLATFORM_CFG_H_`

Reduce unnecessary differences between AMD based boards only
using the file `platform_cfg.h` for configuration making them
a little bit easier to compare.

Inagua & co. mention the board name in several places which are really not
that board specific.  Sometimes people even forget to change it:
Union Station’s platform_cfg.h starts with "#ifndef _PERSIMMON_CFG_H_".
Funny.  Change that to "_PLATFORM_CFG_H_" everywhere.

The following command was used.

    $ find . -name platform_cfg.h | xargs sed -i '/_CFG_H_/s/_.*_/_PLATFORM_CFG_H_/'

More boards seem to use that kind of naming (`git grep _CFG_H_`)
but it is not certain that this will not break anything as for
example the board AMD Dinar also has header files for
configuration stuff for the north- and southbridge.

    $ git grep _CFG_H_
    […]
    src/mainboard/amd/dinar/platform_cfg.h:#ifndef _PLATFORM_CFG_H_
    src/mainboard/amd/dinar/platform_cfg.h:#define _PLATFORM_CFG_H_
    src/mainboard/amd/dinar/platform_cfg.h:#endif //_PLATFORM_CFG_H_
    src/mainboard/amd/dinar/rd890_cfg.h:#ifndef  _RD890_CFG_H_
    src/mainboard/amd/dinar/rd890_cfg.h:#define _RD890_CFG_H_
    src/mainboard/amd/dinar/rd890_cfg.h:#endif //_RD890_CFG_H_
    src/mainboard/amd/dinar/sb700_cfg.h:#ifndef _SB700_CFG_H_
    src/mainboard/amd/dinar/sb700_cfg.h:#define _SB700_CFG_H_
    src/mainboard/amd/dinar/sb700_cfg.h:#endif //_SB700_CFG_H
    […]

Change-Id: Ida15fa6a7adfc770240ac30e795946000dae3f16
Signed-off-by: Jens Rottmann <JRottmann@LiPPERTembedded.de>
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/2464
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martin.roth@se-eng.com>

src/mainboard/advansus/a785e-i/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _A785E_I_CFG_H_
-#define _A785E_I_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M

src/mainboard/amd/inagua/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _INAGUA_CFG_H_
-#define _INAGUA_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M

src/mainboard/amd/persimmon/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _PERSIMMON_CFG_H_
-#define _PERSIMMON_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M

src/mainboard/amd/south_station/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _PERSIMMON_CFG_H_
-#define _PERSIMMON_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M

src/mainboard/amd/torpedo/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _SB900_CFG_H_
-#define _SB900_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 #include <stdint.h>
 

src/mainboard/amd/union_station/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _PERSIMMON_CFG_H_
-#define _PERSIMMON_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M

src/mainboard/asrock/e350m1/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _E350M1_CFG_H_
-#define _E350M1_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M

src/mainboard/asus/m5a88-v/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _M5A88_V_CFG_H_
-#define _M5A88_V_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M

src/mainboard/avalue/eax-785e/platform_cfg.h

@@ -18,8 +18,8 @@
  */
 
 
-#ifndef _EAX_785E_CFG_H_
-#define _EAX_785E_CFG_H_
+#ifndef _PLATFORM_CFG_H_
+#define _PLATFORM_CFG_H_
 
 /**
  * @def BIOS_SIZE_1M