OF: MIPS: lantiq: implement OF support

Activate USE_OF, add a sample DTS file and convert the core soc code to OF.

Signed-off-by: John 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: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/lantiq/Kconfig b/arch/mips/lantiq/Kconfig
index 2780461..9485fe5 100644
--- a/arch/mips/lantiq/Kconfig
+++ b/arch/mips/lantiq/Kconfig
@@ -18,4 +18,13 @@
 	select HW_HAS_PCI
 endchoice
 
+
+choice
+	prompt "Devicetree"
+
+config DT_EASY50712
+	bool "Easy50712"
+	depends on SOC_XWAY
+endchoice
+
 endif