__flush_cache_all for m54xx is intrinsically related to the bit
definitions in m54xxacr.h.  Move it there from cacheflush_no.h,
for easier maintenance.
Signed-off-by: NPhilippe De Muyter <phdm@macqel.be>
Signed-off-by: NGreg Ungerer <gerg@uclinux.org>