common/iavf: add QFI fields for GTPU UL and DL
common/iavf: add QFI fields for GTPU UL and DL

The QFI is 6-bit "QoS Flow Identifier" within the GTPU Extension Header.
Add virtchnl fields QFI of GTPU UL/DL for supporting the AVF FDIR.

Signed-off-by: Junfeng Guo <4e83c95a099a2e36f95a0baa7b159dfaca2b98e9@intel.com>
Signed-off-by: Haiyue Wang <037d5f2d0d83548aebdad8ba0c69c0b30ec44c86@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

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