Per PCIe r4.0, sec 9.2.1.4, VFs can not implement INTX, and their Interrupt
Line and Interrupt Pin registers must be RO Zero.  Some devices have
thousands of VFs, so skip reading the registers as an optimization.
Signed-off-by: NKarimAllah Ahmed <karahmed@amazon.de>
Signed-off-by: NJan H. Schönherr <jschoenh@amazon.de>
[bhelgaas: changelog, comment]
Signed-off-by: NBjorn Helgaas <helgaas@kernel.org>