sh3 todr and timecounter conversion

Everyone,

I've posted changes to update all sh3 ports (dreamcast, mmeye, evbsh3,
hpcsh, and landisk) to the generic todr and timecounter framework.

I do not have any hardware, so I would be really grateful if folks could
test them.

A good test of timecounters is to do:

# date; /bin/time sleep 10; date

and check the results, comparing also against real-time with a stop watch.

The diffs are at http://garrett.damore.org/software/netbsd/sh3.diff

Thank you.

-- 
Garrett D'Amore, Principal Software Engineer
Tadpole Computer / Computing Technologies Division,
General Dynamics C4 Systems
http://www.tadpolecomputer.com/
Phone: 951 325-2134  Fax: 951 325-2191