etnaviv: fix etna_bo_from_name

etnaviv: fix etna_bo_from_name

Look up BOs from the name table using the name parameter instead of
req.handle (which at this point is always zero).

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Wladimir J. van der Laan <laanwj@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>