Sun Ultra 25 works with FreeBSD/sparc64

[Ayan George]

Hi all --

I don't see the Sun Ulra 25 in the supported systems list but I've
been running FreeBSD/sparc64 on a Sun Ulra 25 for a while without
any problems.

I assume that the Ultra 45 will work as well since it is so similar.
Perhaps they should be added to the list at:

  https://www.freebsd.org/platforms/sparc.html

If anyone needs any additional information to verify this, please
let me know.

Thank you for all of your work!

-ayan