sunxi: mellowflyc5: align U-Boot DTS DRAM voltage with hardware and defconfig

Author: deece

patch/u-boot/v2026.07-sunxi64/board_mellowflyc5/001-mellowflyc5-dts-and-defconfig.patch

@@ -221,8 +221,8 @@ index 00000000000..d31248603d3
 +
 +			reg_dcdc3: dcdc3 {
 +				regulator-always-on;
-+				regulator-min-microvolt = <1100000>;
-+				regulator-max-microvolt = <1100000>;
++				regulator-min-microvolt = <1200000>;
++				regulator-max-microvolt = <1200000>;
 +				regulator-name = "vdd-dram";
 +			};
 +		};