efi_loader: fix memory mapping for sandbox

efi_loader: fix memory mapping for sandbox

The sandbox is using a virtual address space which is neither the physical
address space of the operating system nor the virtual address space in
which Linux aplications live. The addresses used insided the flattened
device tree use this sandbox virtual address space. The EFI subsystem uses
the virtual address space of the operating system and this is where the fdt
is stored.

Fix all incorrect addresses for the fdt in cmd/bootefi.cmd.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>