Some endpoints like SDExpress cards have the GPIO to notify the host when
card is removed.
Introducing this flag for such endpoints. When this flag is present, PCIe
driver will use this flag while dumping registers at the time of linkdown.
If card removal causes linkdown, PCIe driver will not dump the PCIe
registers else it will.
Change-Id: I4e5870dbf2190501d96e7d7ed6feb0c1f72b7ded