ice: realloc VSI stats arrays

Previously only case when queues amount is lower was covered. Implement
realloc for case when queues amount is higher than previous one. Use
krealloc() function and zero new allocated elements.

It has to be done before ice_vsi_def_cfg(), because stats element for
ring is set there.

Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Tested-by: Sujai Buvaneswaran <sujai.buvaneswaran@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>