EXYNOS: Add SMDK5250 board support

SMDK5250 board is based on Samsungs EXYNOS5250 SoC.

Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 74d3dc5..8818877 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -717,6 +717,7 @@
 
 	origen			ARM ARMV7 (EXYNOS4210 SoC)
 	SMDKV310		ARM ARMV7 (EXYNOS4210 SoC)
+	SMDK5250		ARM ARMV7 (EXYNOS5250 SoC)
 
 Heungjun Kim <riverful.kim@samsung.com>