etnaviv: Replace seqno tracking with stream pointer tracking

Instead of tracking ad-hoc sequential numbers of each stream
and each BO, and use those to determine whether a BO is in that
stream, use the stream pointer itself.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Christian Gmeiner <christian.gmeiner@gmail.com>
Cc: Guido Günther <guido.gunther@puri.sm>
Cc: Lucas Stach <l.stach@pengutronix.de>
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