MIPS: c-r4k: Extend way_string array

The L2 cache in the I6400 core has 16 ways, so extend the way_string
array to take such caches into account.

[ralf@linux-mips.org: Other already supported CPUs are free to support
more than 8 ways of cache as well.]

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10640/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>