[nrf fromlist] dts: vendor: nordic: Fix invalid nrf54lm20a partition layout

This device indicates 4KiB sector size and has an impossible
partition layout that starts part the way through a sector,
this fixes the issue by having proper partition alignment

Upstream PR #: 100535

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

dts/vendor/nordic/nrf54lm20a_partition.dtsi

@@ -21,17 +21,17 @@
 
 		slot0_partition: partition@10000 {
 			label = "image-0";
-			reg = <0x10000 DT_SIZE_K(922)>;
+			reg = <0x10000 DT_SIZE_K(920)>;
 		};
 
-		slot1_partition: partition@f6800 {
+		slot1_partition: partition@f6000 {
 			label = "image-1";
-			reg = <0xf6800 DT_SIZE_K(922)>;
+			reg = <0xf6000 DT_SIZE_K(920)>;
 		};
 
-		storage_partition: partition@1dd000 {
+		storage_partition: partition@1dc000 {
 			label = "storage";
-			reg = <0x1dd000 DT_SIZE_K(32)>;
+			reg = <0x1dc000 DT_SIZE_K(36)>;
 		};
 	};
 };