common/iavf: replace macro for MAC address length
common/iavf: replace macro for MAC address length

Replace ETH_ALEN with VIRTCHNL_ETH_LENGTH_OF_ADDRESS to keep consistent.

Signed-off-by: Maciej Rabeda <83b81006e2905feb461027d30b07d03093a00e20@intel.com>
Signed-off-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>
Acked-by: Beilei Xing <7fb7e49de6d75fb4140bfcdada52e66859d93ebd@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk