ice: fix memory allocation call

Fix the order of number of array members and member size parameters in a
*calloc() call.

Fixes: b3c38904

 ("ice: avoid unnecessary single-member variable-length structs")
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>