vRDMA Network Type Not Supported

[cspnanda]

Is your feature request related to a problem? Please describe.
govc vm.create -m 2048 -c 2 -g freebsd64Guest -net.adapter vmxnet3vrdma -net=Management -disk.controller pvscsi -ds=vsanDatastore -dc=Datacenter -cluster=Cluster vm-name
govc: unknown ethernet card type 'vmxnet3vrdma'

Describe the solution you'd like
The VM Creation should succeed.

Describe alternatives you've considered
None

Additional context
PVRDMA is an important type of Virtual Ethernet Card which allows High Performance and Low Latency Communication over RcOE.

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