Unfortunately we cannot do this yet, as when booting with QEMU the
devicetree is provided at the start of memory. Until we have a built-in
way to handle copying this, we must retain the fdt_addr variable.
This reverts commit acc02734be265e92ec88ace5ac097ccb3099d40f.
Signed-off-by: Simon Glass <sjg@chromium.org>
ff3028bdef