Revert "efi: arm: Drop setting of fdt_addr"

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>

board/efi/efi-arm_app/efi-arm_app.env

@@ -6,6 +6,7 @@
  */
 
 /* common console settings */
+fdt_addr=40000000
 stdin=serial
 stdout=serial,vidconsole
 stderr=serial,vidconsole