[U-Boot] db-88f6820-amc board fails to boot with latest u-boot master

[Chris Packham]

Hi,

I just tried UART booting db-88f6820-amc with the latest u-boot master
and it fails to reach the normal u-boot prompt. I don't know if this
affects the normal SPI booting.

I've bisected down to commit 94084eea3bd3 ("tools: kwbimage: Fix dest addr").

Reverting this gets things working again, but I'm guessing it'll break
secure boot. Should the size adjustment be conditional on something?
Does db-88f6820-amc_defconfig need something that the other armada
configs have enabled?

Thanks,
Chris