bnxt_en: Report PCIe link properties with pcie_print_link_status()

bnxt_en: Report PCIe link properties with pcie_print_link_status()

Orabug: 28942099

Previously the driver used pcie_get_minimum_link() to warn when the NIC
is in a slot that can't supply as much bandwidth as the NIC could use.

pcie_get_minimum_link() can be misleading because it finds the slowest link
and the narrowest link (which may be different links) without considering
the total bandwidth of each link.  For a path with a 16 GT/s x1 link and a
2.5 GT/s x16 link, it returns 2.5 GT/s x1, which corresponds to 250 MB/s of
bandwidth, not the true available bandwidth of about 1969 MB/s for a
16 GT/s x1 link.

Use pcie_print_link_status() to report PCIe link speed and possible
limitations instead of implementing this in the driver itself.  This finds
the slowest link in the path to the device by computing the total bandwidth
of each link and compares that with the capabilities of the device.

The dmesg change is:

  - PCIe: Speed %s Width x%d
  + %u.%03u Gb/s available PCIe bandwidth (%s x%d link)

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
[backport of upstream commit af125b754e2f09e6061e65db8f4eda0f7730011d]

Signed-off-by: Brian Maly <brian.maly@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>
[backport of UEK5 commit 48b32a7f2b4dddafbf42cde882c3c84c556fb477]
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Conflicts:
	drivers/net/ethernet/broadcom/bnxt/bnxt_compat.c
	drivers/net/ethernet/broadcom/bnxt/bnxt_compat.h

Signed-off-by: Brian Maly <brian.maly@oracle.com>