gve: Make LRO work for jumbo packets

[shailend_google.com]

Summary

Each Rx descriptor points to a packet buffer of size 2K, which means
that MTUs greater than 2K see multi-descriptor packets. The TCP-hood of
such packets was being incorrectly determined by looking for a flag on
the last descriptor instead of the first descriptor.

Also fixed and preogressed the version number.

[markj]

The main diff looks ok to me, I just don't understand the alignment change.

sys/dev/gve/gve.h

169

What's the purpose of increasing the alignment here? There's no mention of this in the review description.

If you want specific alignment within struct gve_rx_ring, wouldn't it be better to specify the alignment there?

[shailend_google.com]

Removed the spurious alignment

[shailend_google.com]

sys/dev/gve/gve.h

169

Thanks, removed the unnecessary alignment.