dts: stm2wb: Limit flash size to 512 for now

We don't want to mess with CM-0 firmware for now.

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

dts/arm/st/wb/stm32wb55Xg.dtsi

@@ -23,7 +23,7 @@
 	soc {
 		flash-controller@58004000 {
 			flash0: flash@8000000 {
-				reg = <0x08000000 DT_SIZE_K(1024)>;
+				reg = <0x08000000 DT_SIZE_K(512)>;
 			};
 		};
 	};