PCI/ASPM: Clean up ASPM disable/enable mask calculation

PCI/ASPM: Clean up ASPM disable/enable mask calculation

With only one set of defines remaining, state can be almost used as-is to
set ->aspm_disable/default. Only CLKPM and L1 PM substates need special
handling.

Remove unnecessary if conditions that can use the state variable bits
directly. Move ASPM mask calculation into pci_calc_aspm_enable_mask() and
pci_calc_aspm_disable_mask() helpers which makes it easier to alter state
variable directly.

Link: https://lore.kernel.org/r/20240322123952.6384-3-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>