i965: Drop render_target_start from binding table struct.
We have to start render targets at binding table index 0 in order to use headerless FB write messages, and in fact already assume this in a bunch of places in the code. Let's finish that off, and not bother storing 0 in a struct to pretend to add it in a few places. Reviewed-by: Iago Toral Quiroga <firstname.lastname@example.org>
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