Update RCar setup guide
Starting Apertis v2021dev3 we have full support of all ostree capabilities as we have for SabreLite board. To support all features U-Boot should be updated to version 2020.04+dfsg-2co5bv2022dev0b2 or later. Set proper links to proper U-Boot version and images in setup documentation.
Signed-off-by: Denis Pynkin denis.pynkin@collabora.com
Edited by Denis Pynkin