powerpc: T1042RDB: Remove macro CONFIG_T1042RDB

Use TARGET_T1042RDB instead.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/t104xrdb/eth.c b/board/freescale/t104xrdb/eth.c
index 9d8ead4..ab8c8bb 100644
--- a/board/freescale/t104xrdb/eth.c
+++ b/board/freescale/t104xrdb/eth.c
@@ -52,7 +52,7 @@
 						CONFIG_SYS_SGMII1_PHY_ADDR);
 			break;
 #endif
-#ifdef CONFIG_T1042RDB
+#ifdef CONFIG_TARGET_T1042RDB
 		case PHY_INTERFACE_MODE_SGMII:
 			/* T1042RDB doesn't supports SGMII on DTSEC1 & DTSEC2 */
 			if ((FM1_DTSEC1 == i) || (FM1_DTSEC2 == i))