powerpc: T1040RDB: Remove macro CONFIG_T1040RDB

Use CONFIG_TARGET_T1040RDB 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 ea9f450..cbce840 100644
--- a/board/freescale/t104xrdb/eth.c
+++ b/board/freescale/t104xrdb/eth.c
@@ -43,7 +43,7 @@
 		int idx = i - FM1_DTSEC1;
 
 		switch (fm_info_get_enet_if(i)) {
-#if defined(CONFIG_T1040RDB) || defined(CONFIG_TARGET_T1040D4RDB)
+#if defined(CONFIG_TARGET_T1040RDB) || defined(CONFIG_TARGET_T1040D4RDB)
 		case PHY_INTERFACE_MODE_SGMII:
 			/* T1040RDB & T1040D4RDB only supports SGMII on
 			 * DTSEC3