In case anyone else has this question, I was informed by the vmware vsphere/vcenter team that vGPU live migration is supported, but DRS is not. DRS currently provides the recommendations for the migrations needed, but will not automatically apply those recommendations.
It requires manually pushing the "Apply Recommendations".
I'm amazed at this answer since the functionality is obviously built in, but not supported. I'm looking into writing a script to apply these recommendations when they exist as a workaround.