v3dv: revert the decision that the command buffer takes ownership of BOs

v3dv: revert the decision that the command buffer takes ownership of BOs

The CLs in the command buffer will reference BOs allocated by the application
such as images and buffers, that will be destroyed by the application, so
destroying them with the command buffer won't be correct.

For now, let's just assume that the comman buffer only owns the BOs
it explicitly allocates and that other abstractions own their own
BOs and are responsible from freeing them.

In the future, we might consider a ref/unref system similar to v3d's, but
for now this should work.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>