PCI/bwctrl: Replace lbms_count with PCI_LINK_LBMS_SEEN flag

PCIe BW controller counted LBMS assertions for the purposes of the Target
Speed quirk (pcie_failed_link_retrain()). It was also a plan to expose the
LBMS count through sysfs to allow better diagnosing link related issues.
Lukas Wunner suggested, however, that adding a trace event would be better
for diagnostics purposes, leaving only pcie_failed_link_retrain() as a user
of the lbms_count.

The logic in pcie_failed_link_retrain() does not require keeping count of
LBMS assertions, so replace lbms_count with a simple flag in pci_dev's
priv_flags.  The reduced complexity allows removing pcie_bwctrl_lbms_rwsem.

Since pcie_failed_link_retrain() runs before bwctrl is probed during boot,
the LBMS in Link Status register still has to be checked by the quirk.

The priv_flags numbering is not continuous because hotplug code added a few
flags to fill numbers 4-5 (hotplug and bwctrl changes are routed through in
different branches).

Suggested-by: Lukas Wunner <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <[email protected]>
[kwilczynski: squashed a fix to resolve build failures from
https://lore.kernel.org/all/[email protected]]
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Reviewed-by: Lukas Wunner <[email protected]>
Link: https://patch.msgid.link/[email protected]

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