ARM: dts: i.MX51: digi-connectcore-som: Remove unused regulators

VGEN1, VGEN2 and GPO1 regulators are not used on SOM.
Let's remove these entries.
Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx51-digi-connectcore-som.dtsi

@@ -102,18 +102,6 @@ vcam_reg: vcam {
 				regulator-always-on;
 			};
 
-			vgen1_reg: vgen1 {
-				regulator-min-microvolt = <1200000>;
-				regulator-max-microvolt = <1200000>;
-				regulator-always-on;
-			};
-
-			vgen2_reg: vgen2 {
-				regulator-min-microvolt = <3150000>;
-				regulator-max-microvolt = <3150000>;
-				regulator-always-on;
-			};
-
 			vgen3_reg: vgen3 {
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
@@ -124,8 +112,6 @@ vusb_reg: vusb {
 				regulator-always-on;
 			};
 
-			gpo1_reg: gpo1 { };
-
 			gpo2_reg: gpo2 { };
 
 			gpo3_reg: gpo3 { };