exynos5250: config: disable max77686 driver

This PMIC is not common for all Exynos5250
based boards, so should be romoved from
common config.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Cc: Simon Glass <sjg@chromium.org>
Cc: Minkyu Kang <mk7.kang@samsung.com>

include/configs/exynos5250-common.h

@@ -28,9 +28,6 @@
 
 #define CONFIG_SYS_INIT_SP_ADDR	CONFIG_IRAM_STACK
 
-/* PMIC */
-#define CONFIG_POWER_MAX77686
-
 /* Sound */
 #define CONFIG_CMD_SOUND
 #ifdef CONFIG_CMD_SOUND