net/ice: support VXLAN VNI field in flow director

net/ice: support VXLAN VNI field in flow director

Add support for VNI field in FDIR. Treat VXLAN flow type as
ICE_FLTR_PTYPE_NONF_IPV4_UDP_VXLAN to align with shared code. It
allows to match outer L2/L3, VNI and inner L2/L3 fields with VXLAN
pattern.
VNI takes 24 bits in VXLAN header, but uses 32 bits for matching in
shared code. The 8 bits reserved field adjacent should always be 0.

Signed-off-by: Zhirun Yan <zhirun.yan@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>