sh64: Kill off old exception debugging helpers.

sh64: Kill off old exception debugging helpers.

There's not much here that we can't get at through alternate means (aside
from the TLB contents, but that doesn't belong here anyways). Most of
this information is already provided by the sh32 routines, which we'll
consolidate on next.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>