Activate USE_OF, add a sample DTS file and convert the core soc code to OF.
Signed-off-by: NJohn Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3803/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>