BugLink: http://bugs.launchpad.net/bugs/1558342

Move definitions for generic PCI host controller driver structures to a
separate header file so we can share them with other drivers.  No
functional change intended.

[bhelgaas: split into separate patch, changelog]
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Will Deacon <will.deacon@arm.com>
(cherry picked from linux-next commit 7149b9fd)
[dannf: modified to move the structures as they were in v4.4]
Signed-off-by: dann frazier <dann.frazier@canonical.com>