IB/hfi1: Move saving PCI values to a separate function

During PCIe initialization some registers' values from
PCI config space are saved in order to restore them later
(i.e. after reset). Restoring those value is done by a
function called restore_pci_variables, while saving them
is put directly into function hfi1_pcie_ddinit.
Move saving values to a separate function in the image
of restoring functionality.

Reviewed-by: Jakub Byczkowski <[email protected]>
Reviewed-by: Mike Marciniszyn <[email protected]>
Signed-off-by: Bartlomiej Dudek <[email protected]>
Signed-off-by: Dennis Dalessandro <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>

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