ARM: dts: Update min voltage for vdd_arm on Arndale

The minimum recommended ARM voltage for Exynos5250 at 200MHz
on Arndale board is 0.9125V. Update accordingly.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos5250-arndale.dts

@@ -266,7 +266,7 @@
 
 				buck2_reg: BUCK2 {
 					regulator-name = "vdd_arm";
-					regulator-min-microvolt = <925000>;
+					regulator-min-microvolt = <912500>;
 					regulator-max-microvolt = <1300000>;
 					regulator-always-on;
 					regulator-boot-on;