ARM: dts: stm32: use correct vqmmc regu for eMMC on stm32mp1 ED1/EV1 boards

On those boards, as stated in schematics files, the regulator used for IOs
is VDD. It was wrongly set to v3v3.
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c-ed1.dts

@@ -334,7 +334,7 @@ &sdmmc2 {
 	st,neg-edge;
 	bus-width = <8>;
 	vmmc-supply = <&v3v3>;
-	vqmmc-supply = <&v3v3>;
+	vqmmc-supply = <&vdd>;
 	mmc-ddr-3_3v;
 	status = "okay";
 };