anv: add support for dynamic primitive topology change

anv: add support for dynamic primitive topology change

This is done using 3DSTATE_VF_TOPOLOGY packet that overrides topology
used in subsequent 3DPRIMITIVE commands. For gen7[5] we override the
pipeline topology when emitting draw commands.

v2: fix the way gen7[5] is handled (Lionel)

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5604>