m68k: merge the non-MMU and MMU versions of swab.h

It is trivial to merge the non-MMU and MMU versions of swab.h.
Without a single file "make headers_install" is broken for m68k
(since each of the sub-varients of swab.h are not installed).
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

arch/m68k/include/asm/swab.h

-#ifdef __uClinux__
-#include "swab_no.h"
-#else
-#include "swab_mm.h"
+#ifndef _M68K_SWAB_H
+#define _M68K_SWAB_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#define __SWAB_64_THRU_32__
+
+#if defined (__mcfisaaplus__) || defined (__mcfisac__)
+static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
+{
+	__asm__("byterev %0" : "=d" (val) : "0" (val));
+	return val;
+}
+
+#define __arch_swab32 __arch_swab32
+#elif !defined(__uClinux__)
+
+static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
+{
+	__asm__("rolw #8,%0; swap %0; rolw #8,%0" : "=d" (val) : "0" (val));
+	return val;
+}
+#define __arch_swab32 __arch_swab32
 #endif
+
+#endif /* _M68K_SWAB_H */

arch/m68k/include/asm/swab_mm.h

-#ifndef _M68K_SWAB_H
-#define _M68K_SWAB_H
-
-#include <asm/types.h>
-#include <linux/compiler.h>
-
-#define __SWAB_64_THRU_32__
-
-static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
-{
-	__asm__("rolw #8,%0; swap %0; rolw #8,%0" : "=d" (val) : "0" (val));
-	return val;
-}
-#define __arch_swab32 __arch_swab32
-
-#endif /* _M68K_SWAB_H */

arch/m68k/include/asm/swab_no.h

-#ifndef _M68KNOMMU_SWAB_H
-#define _M68KNOMMU_SWAB_H
-
-#include <linux/types.h>
-
-#if defined(__GNUC__) && !defined(__STRICT_ANSI__) || defined(__KERNEL__)
-#  define __SWAB_64_THRU_32__
-#endif
-
-#if defined (__mcfisaaplus__) || defined (__mcfisac__)
-static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
-{
-	asm(
-			"byterev %0"
-			: "=d" (val)
-			: "0" (val)
-	   );
-	return val;
-}
-
-#define __arch_swab32 __arch_swab32
-#endif
-
-#endif /* _M68KNOMMU_SWAB_H */