ARM: dts: qcom: msm8960-cdp: move regulator out of simple-bus

Regulators is not a bus, so drop incomplete simple-bus usage to fix dtbs
W=1 warning:

  Warning (simple_bus_reg): /regulators/gpio-regulator: missing or empty reg/ranges property
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230420075053.41976-9-krzysztof.kozlowski@linaro.org

arch/arm/boot/dts/qcom-msm8960-cdp.dts

@@ -15,16 +15,12 @@ chosen {
 		stdout-path = "serial0:115200n8";
 	};
 
-	regulators {
-		compatible = "simple-bus";
-
-		ext_l2: gpio-regulator {
-			compatible = "regulator-fixed";
-			regulator-name = "ext_l2";
-			gpio = <&msmgpio 91 0>;
-			startup-delay-us = <10000>;
-			enable-active-high;
-		};
+	ext_l2: gpio-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "ext_l2";
+		gpio = <&msmgpio 91 0>;
+		startup-delay-us = <10000>;
+		enable-active-high;
 	};
 };