ath79: wr1043: fix DTC warnings

Use the "correct" unit name to avoid DTC warnings.

Signed-off-by: Karl Palsson <karlp@etactica.com>

target/linux/ath79/dts/ar9132_tl-wr1043nd-v1.dts

@@ -141,7 +141,7 @@
 				read-only;
 			};
 
-			partition@020000 {
+			partition@20000 {
 				label = "firmware";
 				reg = <0x020000 0x7D0000>;
 			};