boards: nucleo_u5a5zj_q: Fix storage address

Fix start address of storage partition.
Address did not match reg address of devicetree node, and the size of
the storage partition would make it exceed flash region.

(cherry picked from commit 816b615)

Original-Signed-off-by: Joakim Andersson <[email protected]>
GitOrigin-RevId: 816b615
Cr-Build-Id: 8740450565536499009
Cr-Build-Url: https://cr-buildbucket.appspot.com/build/8740450565536499009
Change-Id: Icc4aa51d4abc56e1f522cc9720ec356f61c42280
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5761294
Tested-by: Jeremy Bettis <[email protected]>
Commit-Queue: Jeremy Bettis <[email protected]>
Tested-by: ChromeOS Prod (Robot) <[email protected]>
Reviewed-by: Jeremy Bettis <[email protected]>

boards/st/nucleo_u5a5zj_q/nucleo_u5a5zj_q.dts

@@ -58,7 +58,7 @@
 		};
 		storage_partition: partition@3e2000 {
 			label = "storage";
-			reg = <0x003f0000 DT_SIZE_K(120)>;
+			reg = <0x003e2000 DT_SIZE_K(120)>;
 		};
 
 	};