m68k: CPU32 does not support unaligned accesses

Hence select CPU_HAS_NO_UNALIGNED

Reported-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Greg <Ungerer&lt;gerg@uclinux.org>