Add option to pass-through all GPU devices

[ajgringo619]

Thank you so much for this tool! I'd been loathe to try setting up GPU pass-through again; now I've eliminated dual-boot once and for all.

I just switched to another GPU (Nvidia GXT 1660). During the phase where I select the devices to pass through, I'm only offered the GPU and the HDMI sound card; this was the same with the previous card (GTX 1050). However, this new(er) card also had these devices (this is a list of the IOMMU group):

Group 15:	[10de:21c4] [R] 09:00.0  VGA compatible controller                TU116 [GeForce GTX 1660 SUPER]
		[10de:1aeb]     09:00.1  Audio device                             TU116 High Definition Audio Controller
		[10de:1aec]     09:00.2  USB controller                           TU116 USB 3.1 Host Controller
		[10de:1aed]     09:00.3  Serial bus controller                    TU116 USB Type-C UCSI Controller

Since QEMU seems to require that the entire IOMMU group is using VFIO drivers, I had to add the last (2) devices to the vfio.conf and rebuild initramfs before the pass-through worked. Can it be added to your script to allow selection of all devices attached to a GPU?