ARM: vexpress: Add fixed regulator for SMSC

SMSC driver requires "vdd33a" and "vddvario" regulator supplies now.

Add fixed regulator describing 3V3 power line (in both motherboard's
Device Trees and the non-DT code) and force fixed regulator config
option if regulators framework is enabled.

Signed-off-by: Pawel Moll <pawel.moll@arm.com>

arch/arm/boot/dts/vexpress-v2m-rs1.dtsi

@@ -55,6 +55,8 @@
 			reg-io-width = <4>;
 			smsc,irq-active-high;
 			smsc,irq-push-pull;
+			vdd33a-supply = <&v2m_fixed_3v3>;
+			vddvario-supply = <&v2m_fixed_3v3>;
 		};
 
 		usb@2,03000000 {
@@ -198,5 +200,13 @@
 				interrupts = <14>;
 			};
 		};
+
+		v2m_fixed_3v3: fixedregulator@0 {
+			compatible = "regulator-fixed";
+			regulator-name = "3V3";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+			regulator-always-on;
+		};
 	};
 };