etnaviv: add anisotropic filter support

I have not seen any usage of TEXTURE_FILTER_ANISOTROPIC in the cmd streams
from the binary blob. Maybe it gets used on some model/rev combinations.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2888>
3 files changed