I recently added support for the NorthStar ARM BCM53xx SoCs
to the upstream U-Boot. This is a back port on top of the
2023.04 version already imported to OpenWrt with the 5 necessary
upstream patches.

This is needed to create a small U-Boot for the BCM53xx-based
D-Link DIR-890L and I think also the DIR-885L, so that a
recent (bigger) kernel can be loaded and executed from the
SEAMA partitions on these devices.
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>