PCI/ASPM: Set only ASPM_STATE_L1 when driver enables L1

Previously pci_enable_link_state(PCIE_LINK_STATE_L1) enabled L1SS as well
as L1.  Enable only ASPM_STATE_L1 when the caller enables L1.

The only current caller is vmd_pm_enable_quirk(), which enables *all* ASPM
states, so this should have no functional effect.

[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20230504111301.229358-3-ajayagarwal@google.com


Signed-off-by: Ajay Agarwal <ajayagarwal@google.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>