exynos: Add support for spring

Spring is the first ARM-based HP Chromebook 11. It is similar to snow
and it uses the same Samsung Exynos5250 chip. But has some unusual
features. Mainline support for it has lagged snow (both in kernel and
U-Boot). Now that the exynos5 code is common we can support spring just
by adding a device tree and a few lines of configuration.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/samsung/smdk5250/Kconfig b/board/samsung/smdk5250/Kconfig
index 698ee91..11ffaee 100644
--- a/board/samsung/smdk5250/Kconfig
+++ b/board/samsung/smdk5250/Kconfig
@@ -23,3 +23,16 @@
 	default "snow"
 
 endif
+
+if TARGET_SPRING
+
+config SYS_BOARD
+	default "smdk5250"
+
+config SYS_VENDOR
+	default "samsung"
+
+config SYS_CONFIG_NAME
+	default "spring"
+
+endif
diff --git a/board/samsung/smdk5250/MAINTAINERS b/board/samsung/smdk5250/MAINTAINERS
index 070593e..cde966f 100644
--- a/board/samsung/smdk5250/MAINTAINERS
+++ b/board/samsung/smdk5250/MAINTAINERS
@@ -10,3 +10,9 @@
 S:	Maintained
 F:	include/configs/snow.h
 F:	configs/snow_defconfig
+
+SPRING BOARD
+M:	Simon Glass <sjg@chromium.org>
+S:	Maintained
+F:	include/configs/spring.h
+F:	configs/spring_defconfig