ARM: dts: stm32: Add romem and temperature calibration on stm32f429

Add & enable stm32 factory-programmed memory. Describe temperature sensor
calibration cells.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f429.dtsi

@@ -80,6 +80,19 @@ clk_i2s_ckin: i2s-ckin {
 	};
 
 	soc {
+		romem: nvmem@1fff7800 {
+			compatible = "st,stm32f4-otp";
+			reg = <0x1fff7800 0x400>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			ts_cal1: calib@22c {
+				reg = <0x22c 0x2>;
+			};
+			ts_cal2: calib@22e {
+				reg = <0x22e 0x2>;
+			};
+		};
+
 		timer2: timer@40000000 {
 			compatible = "st,stm32-timer";
 			reg = <0x40000000 0x400>;