zink: Make sure that we keep the existing ici pNext chain on inserts.
For external image imports, we'd lose the mutable image format list, causing turnip to get angry that we try to do UBWC despite not having a UBWC-compatible format list. Cc: mesa-stable Fixes: 28ee911a ("zink: handle mutable swapchain images with dmabuf") Reviewed-by:Mike Blumenkrantz <michael.blumenkrantz@gmail.com> Part-of: <mesa/mesa!17900> (cherry picked from commit 8dda0a01)