liquidio: monitor all of Octeon's cores in watchdog thread

The liquidio_watchdog kernel thread is watching over only 12 cores of the
Octeon CN23XX; it's neglecting the other 4 cores that are present in the
CN2360.  Fix it by defining LIO_MAX_CORES as 16.

Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>