Revert "PCI/ASPM: Save/restore L1SS Capability for suspend/resume"

This reverts commit 4257f7e0.

Kenneth reported that after 4257f7e0, he sees a torrent of disk I/O
errors on his NVMe device after suspend/resume until a reboot.

Link: https://lore.kernel.org/linux-pci/20201228040513.GA611645@bjorn-Precision-5520/


Reported-by: Kenneth R. Crudup <kenny@panix.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>