pm2fb driver

[Naruaki.Etomi]

I was write Permedia2 ("TVP4020") chip driver.

See:
NetBSD Problem Report #49229
pm2fb are not attached on Sparc64 and Alpha.
http://gnats.netbsd.org/49229

I still don't have a reply.

Is there a problem?

Please point it out if there are any mistakes in my code.