dts: arm: st: h7a3/7hb3: streamline flash properties

Some flash properties are currently in the individual SoC definitions,
while they are common to the whole STM32H7A3/STM32H7B3 line. Move them
one level higher.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

Author: aurel32

dts/arm/st/h7/stm32h7a3.dtsi

@@ -11,6 +11,8 @@
 	soc {
 		flash-controller@52002000 {
 			flash0: flash@8000000 {
+				compatible = "soc-nv-flash";
+				label = "FLASH_STM32";
 				write-block-size = <16>;
 				erase-block-size = <DT_SIZE_K(8)>;
 			};

dts/arm/st/h7/stm32h7a3Xi.dtsi

@@ -10,8 +10,6 @@
 	soc {
 		flash-controller@52002000 {
 			flash0: flash@8000000 {
-				compatible = "soc-nv-flash";
-				label = "FLASH_STM32";
 				reg = <0x08000000 DT_SIZE_K(2048)>;
 			};
 		};

dts/arm/st/h7/stm32h7b3Xi.dtsi

@@ -10,8 +10,6 @@
 	soc {
 		flash-controller@52002000 {
 			flash0: flash@8000000 {
-				compatible = "soc-nv-flash";
-				label = "FLASH_STM32";
 				reg = <0x08000000 DT_SIZE_K(2048)>;
 			};
 		};