pmic: max77686 set the same compatible as in the kernel

This commit also updates the proper dts files.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/exynos5250-smdk5250.dts b/arch/arm/dts/exynos5250-smdk5250.dts
index 9273562..3cebfc2 100644
--- a/arch/arm/dts/exynos5250-smdk5250.dts
+++ b/arch/arm/dts/exynos5250-smdk5250.dts
@@ -68,7 +68,7 @@
 	i2c@12c60000 {
 		pmic@9 {
 			reg = <0x9>;
-			compatible = "maxim,max77686_pmic";
+			compatible = "maxim,max77686";
 		};
 	};