[U-Boot] arm64: a37xx: add distro boot compability

Andre Heider
2017-12-02T09:46:33Z

Hi,

this small set improves the usability to ease booting distro shipped
kernels. Tested on espressobin with debian's flash-kernel. I could
successfully boot from usb.

Thanks,
Andre

ps: please keep me cc:'ed, not subscribed