PCI/ASPM: Call pci_save_ltr_state() from pci_save_pcie_state()

ASPM state is saved and restored from pci_save/restore_pcie_state().  Since
the LTR Capability is linked with ASPM, move the LTR save and restore calls
there as well.  No functional change intended.

Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20240128233212.1139663-6-david.e.box@linux.intel.com
Link: https://lore.kernel.org/r/20240223205851.114931-6-helgaas@kernel.org


Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>