ARM: Add new mach-oxnas

Add mach-oxnas directory containing Kconfig.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cdfa6c2..4d48e23 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -804,6 +804,8 @@
 
 source "arch/arm/mach-mmp/Kconfig"
 
+source "arch/arm/mach-oxnas/Kconfig"
+
 source "arch/arm/mach-qcom/Kconfig"
 
 source "arch/arm/mach-realview/Kconfig"