x86: Make CONFIG_RELOC_FIXUP_WORKS generic for all x86 boards

Relocation is not board-specific for the x86 architectrure, so
CONFIG_RELOC_FIXUP_WORKS can be defined globally in the config.h

arch/i386/include/asm/config.h

@@ -21,4 +21,6 @@
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
 
+#define CONFIG_RELOC_FIXUP_WORKS
+
 #endif

include/configs/eNET.h

@@ -29,8 +29,6 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
-#define CONFIG_RELOC_FIXUP_WORKS
-
 /*
  * Stuff still to be dealt with -
  */