PCI/ASPM: Move pci_save_ltr_state() to aspm.c

Even when CONFIG_PCIEASPM is not set, we save and restore the LTR
Capability so that if ASPM L1.2 and LTR were configured by the platform,
ASPM L1.2 will still work after suspend/resume, when that platform
configuration may be lost. See dbbfadf23190 ("PCI/ASPM: Save LTR Capability
for suspend/resume").

Since ASPM L1.2 depends on the LTR Capability, move the save/restore code
to the part of aspm.c that is always compiled regardless of
CONFIG_PCIEASPM.  No functional change intended.

Suggested-by: Bjorn Helgaas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[bhelgaas: commit log, reorder to make this a pure move]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: David E. Box <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>

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