bxe: Add 8727 2500baseX support

[adam.jaremko_freebsd_gmail.com]

Summary

Support 2500Base-X on NetXtreme II BCM57711 adapters according to NVRAM configuration

Test Plan

The hardware and nvram configuration have been thoroughly documented by myself at https://www.dslreports.com/forum/r32393899-Internet-Bypassing-the-HH3K-up-to-2-5Gbps-using-a-BCM57711-NIC

[luca.piccirillo_gmail.com]

sys/dev/bxe/bxe_elink.c

10181

I cannot understand this bitmask conditions. It looks to me that you are enforcing 1G capability to be enabled in cap_mask even for 2_5G. Why?

[adam.jaremko_freebsd_gmail.com]

sys/dev/bxe/bxe_elink.c

10181

I cannot understand this bitmask conditions. It looks to me that you are enforcing 1G capability to be enabled in cap_mask even for 2_5G. Why?

Copy and paste form the warpcore patch as a safe guard against misconfiguration when dealing with ediag eeprom changes. 1G is also required for 2.5G in the context of the mdio setup.

The capability checks should be moved further up to the parent statement.