dm: exynos: Move smdkc100 to generic board

The generic board deadline is approaching, and we need this feature to
enable driver model. Enable CONFIG_SYS_GENERIC_BOARD for smdkc100.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/configs/smdkc100.h

@@ -223,4 +223,6 @@
 
 #define CONFIG_OF_LIBFDT
 
+#define CONFIG_SYS_GENERIC_BOARD
+
 #endif	/* __CONFIG_H */