PCI: Reset both NVIDIA GPU and HDA in ThinkPad P50 workaround

quirk_reset_lenovo_thinkpad_50_nvgpu() resets NVIDIA GPUs to work around
an apparent BIOS defect.  It previously used pci_reset_function(), and
the available method was a bus reset, which was fine because there was
only one function on the bus.  After b516ea586d71 ("PCI: Enable NVIDIA
HDA controllers"), there are now two functions (the HDA controller and
the GPU itself) on the bus, so the reset fails.

Use pci_reset_bus() explicitly instead of pci_reset_function() since it's
OK to reset both devices.

[bhelgaas: commit log, add e0547c81bfcf]
Fixes: b516ea586d71 ("PCI: Enable NVIDIA HDA controllers")
Fixes: e0547c81bfcf ("PCI: Reset Lenovo ThinkPad P50 nvgpu at boot if necessary")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lyude Paul <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Acked-by: Ben Skeggs <[email protected]>
Cc: Lukas Wunner <[email protected]>
Cc: Daniel Drake <[email protected]>
Cc: Aaron Plattner <[email protected]>
Cc: Peter Wu <[email protected]>
Cc: Ilia Mirkin <[email protected]>
Cc: Karol Herbst <[email protected]>
Cc: Maik Freudenberg <[email protected]>

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