MIPS: OCTEON: Move CAVIUM_OCTEON_CVMSEG_SIZE to CPU_CAVIUM_OCTEON

MIPS: OCTEON: Move CAVIUM_OCTEON_CVMSEG_SIZE to CPU_CAVIUM_OCTEON

CVMSEG is related to the CPU core not the SoC system.  So needs to be
configurable there.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: kvm@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7013/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>