odroid: kconfig: add odroid_defconfig

This config is valid for two devices:
- Odroid X2,
- Odroid U3.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Tom Rini <trini@ti.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/configs/odroid_defconfig b/configs/odroid_defconfig
new file mode 100644
index 0000000..a1c7ac5
--- /dev/null
+++ b/configs/odroid_defconfig
@@ -0,0 +1,3 @@
+CONFIG_ARM=y
+CONFIG_ARCH_EXYNOS=y
+CONFIG_TARGET_ODROID=y