MIPS: Probe for new OCTEON CPU/SoC types.

Add probing for CNF71XX, CN78XX and CN70XX.

Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5635/


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