At the moment, the register_bytes_ok arch method is defined
only by m68k-tdep.c. There's no good reason to have this method now,
as remote.c, if it does not see some register in 'g' reply will send
extra 'p' reply just fine. Further, it's hard to decide what's
right size of 'g' reply -- target may have floating point registers, or
might not have, and so on.

This patch removes register_bytes_ok arch method. OK?

- Volodya