v3d: use surface format defined on pipe_blit

v3d: use surface format defined on pipe_blit

When trying to perform a TLB-based blit, we need to create a surface out
of the src and dst resources. But instead of using the same formats as
the resources, we need to use the format that is passed through
pipe_blit_info.

This was making some cases to use the render-based blit instead of the
TLB-based blit, which is more performant.

Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15693>