
Add support for rkrng variant, used by e.g. RK3528 and RK3576. Imported from vendor U-Boot linux-6.1-stan-rkr5 tag with minor adjustments for mainline. Signed-off-by: Lin Jinhan <troy.lin@rock-chips.com> Signed-off-by: Jonas Karlman <jonas@kwiboo.se> Reviewed-by: Kever Yang <kever.yang@rock-chips.com>