tests: drivers: flash: Increase storage partition size

Test requires at least (2 * page_info.size) size for test area. Because
of that, this commit increases storage_partition size for max32690evkit
and max32690fthr boards.

Signed-off-by: Furkan Akkiz <[email protected]>

Author: hfakkiz

tests/drivers/flash/common/boards/max32690evkit_max32690_m4.overlay

@@ -17,7 +17,7 @@
 
 		storage_partition: partition@200000 {
 			label = "storage";
-			reg = <0x200000 DT_SIZE_K(1)>;
+			reg = <0x200000 DT_SIZE_M(1)>;
 		};
 	};
 };

tests/drivers/flash/common/boards/max32690fthr_max32690_m4.overlay

@@ -17,7 +17,7 @@
 
 		storage_partition: partition@200000 {
 			label = "storage";
-			reg = <0x200000 DT_SIZE_K(1)>;
+			reg = <0x200000 DT_SIZE_M(1)>;
 		};
 	};
 };