net/iavf: adjust CRC statistics calculation
net/iavf: adjust CRC statistics calculation

The AVF can support to enable / disable CRC strip, so it needs to adjust
the statistics calculation for ibytes according to offload setting.

Signed-off-by: Haiyue Wang <037d5f2d0d83548aebdad8ba0c69c0b30ec44c86@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

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