Add $(Device/uimage-rt-loader) to Device/zyxel_gs1900 to use lzma
compression for the sysupgrade kernel image. This saves approximately
1 MB of flash space compared to the previous gzip compression, leaving
more room for the rootfs overlay.
Signed-off-by: Klaus Rubenstein <klaus.rubenstein@gmail.com>
Tested-by: Sander Vanheule <sander@svanheule.net> # GS1900-{8,48} A1
Signed-off-by: Sander Vanheule <sander@svanheule.net>