Hide KVM signature when using GPU passthrough to support more GPU models

[alasdairtran]

Currently, when using the GPU passthrough mode, certain GPU models such as Titan X will not work. To reproduce the error:

1. Use a GPU such as Titan X Pascal.
2. Start minikube with minikube start --vm-driver kvm2 --gpu
3. Install the NVIDIA driver: minikube addons enable nvidia-driver-installer

The driver installation will then fail. Further investigation shows that this is because the command nvidia-smi fails with the error Unable to determine the device handle for GPU 0000:0X:00.0: Unknown Error.

The error occurs because NVIDIA doesn't seem to support GPU passthrough for certain lower-end models such as the Titan X family.

The fix for this is to hide the KVM hypervisor signature (see here). I have tested this fix with Titan X Pascal and the NVIDIA driver was installed successfully and the GPU works well without any problem in Minikube. As far as I can tell, I don't think there is any negative side effects of hiding the KVM signature.

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This pull-request has been approved by: alasdairtran
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[minikube-bot]

Can one of the admins verify this patch?

[alasdairtran]

I've signed the CLA.

[tstromberg]

@minikube-bot OK to test