etnaviv: Fake occlusion query capability
This enables the PIPE_CAP_OCCLUSION_QUERY capability without adding an occlusion query type. This is necessary to get Mesa to report desktop GL 2.0 support (to run exciting things such as ioq3's OpenGL 2 renderer), and should be valid because exposing the capability does not guarantee that any counters are actually implemented. Signed-off-by:Wladimir J. van der Laan <laanwj@gmail.com> Reviewed-by:
Christian Gmeiner <christian.gmeiner@gmail.com>