PCI/LINK: Supply IRQ handler so level-triggered IRQs are acked

PCI/LINK: Supply IRQ handler so level-triggered IRQs are acked

A threaded IRQ with a NULL handler does not work with level-triggered
interrupts.  request_threaded_irq() will return an error:

  genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq 16
  pcie_bw_notification: probe of 0000:00:1b.0:pcie010 failed with error -22

For level interrupts we need to silence the interrupt before exiting the
IRQ handler, so just clear the PCI_EXP_LNKSTA_LBMS bit there.

Fixes: e8303bb7a75c ("PCI/LINK: Report degraded links via link bandwidth notification")
Reported-by: Linus Torvalds <[email protected]>
Reported-by: Borislav Petkov <[email protected]>
Signed-off-by: Alexandru Gagniuc <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>