spi: octeon: Move include file from arch/mips to drivers/spi

Move the register definitions to the drivers directory because they
are only used there.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Tested-by: Steven J. Hill <steven.hill@cavium.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2 files changed