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

drivers/pci/pcie/aspm.c

@@ -1173,8 +1173,7 @@ int pci_enable_link_state(struct pci_dev *pdev, int state)
 	if (state & PCIE_LINK_STATE_L0S)
 		link->aspm_default |= ASPM_STATE_L0S;
 	if (state & PCIE_LINK_STATE_L1)
-		/* L1 PM substates require L1 */
-		link->aspm_default |= ASPM_STATE_L1 | ASPM_STATE_L1SS;
+		link->aspm_default |= ASPM_STATE_L1;
 	if (state & PCIE_LINK_STATE_L1_1)
 		link->aspm_default |= ASPM_STATE_L1_1;
 	if (state & PCIE_LINK_STATE_L1_2)