anv: Don't presume to know what address is in a surface relocation

anv: Don't presume to know what address is in a surface relocation

Because our relocation processing happens at EndCommandBuffer time and
because RENDER_SURFACE_STATE objects may be shared by batches, we really
have no clue whatsoever what address is actually written to the relocation
offset in the BO.  We need to stop making such claims to the kernel and
just let it relocate for us.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Cc: "13.0" <mesa-stable@lists.freedesktop.org>