v3d: enable texture filtering anisotropic

v3d: enable texture filtering anisotropic

Seems we already had implemented this feature (see commit 521e1d0275e
"broadcom/vc5: Add support for anisotropic filtering"), but we didn't
enable the proper capability.

Also update the maximum level of anistropy supported.

Fixes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4201
Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15180>