vfio/pci: Reorganize VFIO_DEVICE_PCI_HOT_RESET to use the device set

Like vfio_pci_dev_set_try_reset() this code wants to reset all of the
devices in the "reset group" which is the same membership as the device
set.

Instead of trying to reconstruct the device set from the PCI list go
directly from the device set's device list to execute the reset.

The same basic structure as vfio_pci_dev_set_try_reset() is used. The
'vfio_devices' struct is replaced with the device set linked list and we
simply sweep it multiple times under the lock.

This eliminates a memory allocation and get/put traffic and another
improperly locked test of pci_dev_driver().

Reviewed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alex Williamson <[email protected]>

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