ARM: dts: stm32: fix regulator-sd_switch node on stm32mp157c-ed1 board

This commit fixes regulator-sd_switch node in order to be compliant to
DT validation schema.
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

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

@@ -100,7 +100,8 @@ sd_switch: regulator-sd_switch {
 
 		gpios = <&gpiof 14 GPIO_ACTIVE_HIGH>;
 		gpios-states = <0>;
-		states = <1800000 0x1 2900000 0x0>;
+		states = <1800000 0x1>,
+			 <2900000 0x0>;
 	};
 };