ARM: dts: stm32: change nvmem node name on stm32f429

Change non volatile node name from nvmem to efuse to be compliant
with yaml schema.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f429.dtsi

@@ -80,7 +80,7 @@ clk_i2s_ckin: i2s-ckin {
 	};
 
 	soc {
-		romem: nvmem@1fff7800 {
+		romem: efuse@1fff7800 {
 			compatible = "st,stm32f4-otp";
 			reg = <0x1fff7800 0x400>;
 			#address-cells = <1>;