ARM: dts: sd-600eval: enable 1.8v regulator on LS expansion

This patch enables 1.8v regulator on LS expansion, which should be
always on according to 96boards spec.
Signed-off-by: NSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: NAndy Gross <andy.gross@linaro.org>

arch/arm/boot/dts/qcom-apq8064-arrow-sd-600eval.dts

@@ -140,6 +140,16 @@
 					bias-pull-down;
 				};
 
+				/**
+				 * 1.8v required on LS expansion
+				 * for mezzanine boards
+				 */
+				l15 {
+					regulator-min-microvolt = <1800000>;
+					regulator-max-microvolt = <1800000>;
+					regulator-always-on;
+				};
+
 				l23 {
 					regulator-min-microvolt = <1700000>;
 					regulator-max-microvolt = <1900000>;