bnxt_en: Enhance TX pri counters

bnxt_en: Enhance TX pri counters

The priority packet and byte counters in ethtool -S are returned by
the driver based on the pri2cos mapping.  The assumption is that each
priority is mapped to one and only one hardware CoS queue.  In a
special RoCE configuration, the FW uses combined CoS queue 0 and CoS
queue 1 for the priority mapped to CoS queue 0.  In this special
case, we need to add the CoS queue 0 and CoS queue 1 counters for
the priority packet and byte counters.

Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20251126215648.1885936-2-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>