ARM: dts: lpc32xx: phy3250: fix SD card regulator voltage

The fixed voltage regulator on Phytec phyCORE-LPC3250 board, which
supplies SD/MMC card's power, has a constant output voltage level
of either 3.15V or 3.3V, the actual value depends on JP4 position,
the power rail is referenced as VCC_SDIO in the board hardware manual.

Fixes: d06670e9 ("arm: dts: phy3250: add SD fixed regulator")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>

arch/arm/boot/dts/lpc3250-phy3250.dts

@@ -49,8 +49,8 @@ lcd_reg: regulator@1 {
 		sd_reg: regulator@2 {
 			compatible = "regulator-fixed";
 			regulator-name = "sd_reg";
-			regulator-min-microvolt = <1800000>;
-			regulator-max-microvolt = <1800000>;
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
 			gpio = <&gpio 5 5 0>;
 			enable-active-high;
 		};