T104xRDB: Remove non-TARGET_T1042D4RDB variants

At this point only the TARGET_T1042D4RDB variant of this is supported in
tree, so remove the remaining parts of the other platforms.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/freescale/t104xrdb/Kconfig b/board/freescale/t104xrdb/Kconfig
index e33d317..e481491 100644
--- a/board/freescale/t104xrdb/Kconfig
+++ b/board/freescale/t104xrdb/Kconfig
@@ -1,6 +1,4 @@
-if TARGET_T1040RDB || TARGET_T1040D4RDB || \
-	TARGET_T1042RDB || TARGET_T1042D4RDB || \
-	TARGET_T1042RDB_PI
+if TARGET_T1042D4RDB
 
 config SYS_BOARD
 	default "t104xrdb"