powerpc/eeh: Rely on dev->link_active_reporting

powerpc/eeh: Rely on dev->link_active_reporting

[ Upstream commit 1541a21305ceb10fcf3f7cbb23f3e1a00bbf1789 ]

Use dev->link_active_reporting to determine whether Data Link Layer Link
Active Reporting is available rather than re-retrieving the capability.

Link: https://lore.kernel.org/r/alpine.DEB.2.21.2305310124100.59226@angie.orcam.me.uk
Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Stable-dep-of: 1010b4c012b0 ("powerpc/eeh: Make EEH driver device hotplug safe")
Signed-off-by: Sasha Levin <sashal@kernel.org>