MIPS: lantiq: drop mips_machine support

Before we are able to add OF support, we really want to drop all the bloat
needed to register all the platform devices.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3800/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>