cm3588-nas: switch edge uboot to kwiboo mainline

[lanefu]

Description

Boots cleanly from sdcard even when OEM uboot is installed on EMMC

(was having optee errors using radxa uboot when OEM was on EMMC)

-Boot 2024.04-armbian (May 13 2024 - 20:34:52 +0000)

Model: FriendlyElec NanoPC-T6
DRAM:  16 GiB
Core:  338 devices, 30 uclasses, devicetree: separate
MMC:   mmc@fe2c0000: 1, mmc@fe2e0000: 0
Loading Environment from nowhere... OK
In:    serial@feb50000
Out:   serial@feb50000
Err:   serial@feb50000
Model: FriendlyElec NanoPC-T6
rockchip_dnl_key_pressed: no saradc device found
Net:   No ethernet found.
Hit any key to stop autoboot:  0
Scanning for bootflows in all bootdevs