bnxt: report FEC block stats via standard interface

I must have missed that these stats are only exposed
via the unstructured ethtool -S when they got merged.
Plumb in the structured form.

Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20221130013108.90062-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>