ixgbevf: fix mailbox API compatibility by negotiating supported features

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{
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                        "drivers/net/ethernet/intel/ixgbevf/ixgbevf.h",
                        "drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c",
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                        "drivers/net/ethernet/intel/ixgbevf/vf.h"
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