headers_check fix: m68k, swab.h

fix the following 'make headers_check' warnings:

  usr/include/asm-m68k/swab.h:4: include of <linux/types.h> is preferred over <asm/types.h>
  usr/include/asm-m68k/swab.h:10: found __[us]{8,16,32,64} type without #include <linux/types.h>

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>