Let the "cbar" device property override the cbar value, to work around broken bootloaders
Initial Allwinner A80 support.
print when fixing up cbar value
Add genassym

It's not reeeaaallly required currently, but libc build for some archs
(e.g. arm) wants to run it, and genassym is small enough for it to be
simplest to just include it.
build genassym for TOOLS_BUILDRUMP