lsxl: use default load addresses for legacy boot

The load addresses for the bootcmd_legacy script were taken from the
original bootloader from Buffalo. But newer kernels are too big and the
uncompressing will overwrite parts of the initial ramdisk. Therefore,
we switch to the load addresses which are also used by the other boot
script.

Signed-off-by: Michael Walle <michael@walle.cc>