boards: st: stm32H573 disco kit xspi-nor-flash DTS configuration

This PR defines the "st,stm32-xspi-nor" compatible Node
in conformance to the DTS specifications
Includes the size property (in Bits) of the external NOR device

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

boards/st/stm32h573i_dk/stm32h573i_dk.dts

@@ -273,9 +273,10 @@
 
 	status = "okay";
 
-	mx25lm51245: ospi-nor-flash@90000000 {
+	mx25lm51245: ospi-nor-flash@0 {
 		compatible = "st,stm32-xspi-nor";
-		reg = <0x90000000 DT_SIZE_M(64)>; /* 512 Mbits */
+		reg = <0>;
+		size = <DT_SIZE_M(512)>; /* 512 Mbits */
 		ospi-max-frequency = <DT_FREQ_M(50)>;
 		spi-bus-width = <XSPI_OCTO_MODE>;
 		data-rate = <XSPI_DTR_TRANSFER>;