anv: fix pipeline switch back for non pipelined states

anv: fix pipeline switch back for non pipelined states

Setting state base address can happen even before pipeline is
selected. Also we must ensure it is set to 3D for Gen12, we can't
switch back to an invalid pipeline value (UINT32_MAX).

v2: Reuse helpers (Jason)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: b34422db5e66 ("anv: Implement Gen12 workaround for non pipelined state")
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3396>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3396>