PCI/ASPM: Pass L1SS Capabilities value, not struct aspm_register_info

aspm_calc_l1ss_info() needs only the L1SS Capabilities.  It doesn't need
anything else from struct aspm_register_info, so pass only the Capabilities
value.  No functional change intended.

Link: https://lore.kernel.org/r/20201015193039.12585-11-helgaas@kernel.org


Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>