anv: Always invalidate the VF cache in BeginCommandBuffer

anv: Always invalidate the VF cache in BeginCommandBuffer

I think the reason why we only do this for primaries is that we didn't
expect to have blorp calls in secondaries.  However, you are allowed to
have a full render pass in a secondary command buffer so resolves and
clears can end up in there.  We should just always invalidate.

Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>