trivial: fix missing semicolon

This was accidentally removed in a previous commit

Signed-off-by: Gerwin Klein <gerwin.klein@proofcraft.systems>

src/plat/bcm2837/overlay-rpi3.dts

@@ -39,6 +39,6 @@
 		reserved-memory@0{
 			reg = <0x0 0x1000>;
 			no-map;
-		}
+		};
 	};
 };