x86: move and fold certain type property definitions

Not only is it less code to have them consolidated, it also permits
their use virtually everywhere (since config.h is required to be
included everywhere. (Shouldn't we, btw, follow Linux and remove the
explicit inclusion in favor of command line enforced one?)

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -8,11 +8,16 @@
 #define __X86_CONFIG_H__
 
 #if defined(__x86_64__)
+# define LONG_BYTEORDER 3
 # define CONFIG_PAGING_LEVELS 4
 #else
+# define LONG_BYTEORDER 2
 # define CONFIG_PAGING_LEVELS 3
 #endif
 
+#define BYTES_PER_LONG (1 << LONG_BYTEORDER)
+#define BITS_PER_LONG (BYTES_PER_LONG << 3)
+
 #define CONFIG_X86 1
 #define CONFIG_X86_HT 1
 #define CONFIG_PAGING_ASSISTANCE 1
--- a/xen/include/asm-x86/types.h
+++ b/xen/include/asm-x86/types.h
@@ -55,14 +55,4 @@ typedef char bool_t;
 
 #endif /* __ASSEMBLY__ */
 
-#if defined(__i386__)
-#define BITS_PER_LONG 32
-#define BYTES_PER_LONG 4
-#define LONG_BYTEORDER 2
-#elif defined(__x86_64__)
-#define BITS_PER_LONG 64
-#define BYTES_PER_LONG 8
-#define LONG_BYTEORDER 3
-#endif
-
 #endif /* __X86_TYPES_H__ */