MIPS: OCTEON: Implement the core-16057 workaround

Disable ICache prefetch for certian Octeon II processors.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Aleksey Makarov <aleksey.makarov@auriga.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8938/


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