The virtualized system is configured through kconfig under "External
Options"->"QEMU Virtualization".
To launch the system, simply run "make run". This works both from
output directories, and from the infix root with O= set.
Initial defconfig is based on Buildroot qemu_x86_64_defconfig, with a
Bootlin pre-built toolchain and a very basic qemu.sh script, generated
by a local post-image.sh, for `make run`.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>