smdk5250: config: enable max77686 driver support

This commit enable support for the above driver,
which was disabled in common config.
Signed-off-by: NPrzemyslaw Marczak <p.marczak@samsung.com>
Acked-by: NSimon Glass <sjg@chromium.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Minkyu Kang <mk7.kang@samsung.com>

include/configs/smdk5250.h

@@ -18,6 +18,8 @@
 
 #include <configs/exynos5250-common.h>
 
+/* PMIC */
+#define CONFIG_POWER_MAX77686
 
 #define CONFIG_BOARD_COMMON
 #define CONFIG_ARCH_EARLY_INIT_R