MIPS: SGI-IP27: fix spelling in Copyright

This is a Copyright line, and just a typo slipped through.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Huacai Chen <chenhuacai@kernel.org>
Reviewed-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>