Revert "PCI: Mark LSI FW643 to avoid bus reset"

This reverts commit 29a43dc130ce65d365a8ea9e1cc4bc51005a353e.

29a43dc130ce ("PCI: Mark LSI FW643 to avoid bus reset") by Edmund was based
on the assumption that the LSI / Agere FW643 has a defect such that it
can't recover after a Secondary Bus Reset (SBR).

But Takashi Sakamoto reported that SBR works fine on this same FW643 device
in an AMD Ryzen 5 2400G system, so apparently there is some other aspect of
Edmund's system that accounts for the issue.

The down side of 29a43dc130ce is that when the FW643 is assigned to a VM,
avoiding the SBR means we leak data out of the VM.

Revert 29a43dc130ce until we figure out a better solution.  In the
meantime, we can use the sysfs "reset_method" interface to restrict the
available reset methods.

Link: https://lore.kernel.org/r/20240328212302.1582483-1-helgaas@kernel.org
Fixes: 29a43dc130ce ("PCI: Mark LSI FW643 to avoid bus reset")
Reported-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20240325012135.36861-1-o-takashi@sakamocchi.jp
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

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