this is a continuation of previous work by Pali to add support for the
Turris 1.x board. As the patches were based on u-boot v2022.04, a
nontrivial rebasing was needed.
Some notes:
- Some options that are in SD defconfig are disabled in NOR defconfig
because over the years u-boot grew and the old NOR defconfig will not
fit into NOR memory.
- SD boot with RAM larger than 2GB will only allocate 2GB of RAM (We
were not able to fix this yet)