etnaviv: don't flush own context when updating resource use

etnaviv: don't flush own context when updating resource use

The context is self synchronizing at the GPU side, as commands are
executed in order. We must not flush our own context when updating the
resource use, as that leads to excessive flushing on effectively every
draw call, causing huge CPU overhead.

Fixes: 64813541d575 (etnaviv: fix resource usage tracking across
different pipe_context's)
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>