MFC: 278835
MFC: 278835

sfxge: remove full_packet_size from sfxge_tso_state

It makes sfxge_tso_state smaller and even makes tso_start_new_packet()
few bytes smaller. Data used to calculate packet size are used nearby,
so it should be no problems with cache etc.

Sponsored by:   Solarflare Communications, Inc.
Approved by:    gnn (mentor), glebius

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