doc: rockchip: use idbloader.img for rk3288, rk3328, rk3399

Makefile now produces ready-to-deploy idbloader.img file.

Signed-off-by: Matwey V. Kornilov <matwey.kornilov@gmail.com>
Reviewed-by: Kever Yang<kever.yang@rock-chips.com>
1 file changed