[Intel-wired-lan] Fix for i40e driver: mirroring SEID mixup

[alexandre.ferrieux at orange.com]

Hello,

The attached patch fixes the non-working mirroring feature in all recent 
versions of the i40e driver including the latest (2.9.21).

Simply put, using

  echo 'add 3' > /sys/class/net/eth10/device/sriov/1/ingress_mirror

fails because it passes down the AQ a 0x0260 command with the same SEID (that of 
VF 3) as both mirrored-from and mirrored-to VF.

This was reported to the sourceforge e1000 projet a few days ago as

  https://sourceforge.net/p/e1000/bugs/646/

but I'm following advice given there to send it to you for a "fast track" as the 
repro and diagnosis is trivial and fix already provided.

Hope this helps,

-Alex

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