MIPS: Octeon: Scale Octeon2 clocks in octeon_init_cvmcount()

The per-CPU clocks are synchronized from IPD_CLK_COUNT, on cn63XX it must
be scaled by the clock frequency ratio.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1667/


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