common/iavf: support DCF capability negotiation
common/iavf: support DCF capability negotiation

Add DCF capability flag for VF.
Add an opcode for disabling DCF capability.
Add an virtchnl event code for AVF resetting completion.

Signed-off-by: Xiaoyun Li <151cc00bdba86cfa2ecfc39aaa98def8f092d9d8@intel.com>
Signed-off-by: Paul M Stillwell Jr <e9d07c711ed532f6e96975f8a0cb18bd224808b8@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