bug in SPI on rk3399 devices

[Dennis Gilmore]

I am not sure if it impacts non rk3399 devices or not, but on at least
rk3399 devices after
https://source.denx.de/u-boot/u-boot/-/commit/346df7d4fa62afc578d820b3a18815eec765074f
was applied installing u-boot into SPI flash results in an unbootable
system. SPL loads and runs, u-boot.itb is not found and the boot
hangs.  I am looking into it but would appreciate more eyes on it.

Dennis