radv: add the vertex buffers BO to the list at bind time

radv: add the vertex buffers BO to the list at bind time

This should reduce the overhead of adding a BO to the current
list, especially when the list is huge. Also, when a new pipeline
is bound, we only need to update the descriptor, the buffer objects
should already be in the list.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>