powerpc: B4860QDS: Remove macro CONFIG_B4860QDS

Use CONFIG_TARGET_B4860QDS instead.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/b4860qds/Makefile b/board/freescale/b4860qds/Makefile
index 673d2ea..c032242 100644
--- a/board/freescale/b4860qds/Makefile
+++ b/board/freescale/b4860qds/Makefile
@@ -8,7 +8,8 @@
 obj-y	+= spl.o
 else
 obj-y	+= b4860qds.o
-obj-$(CONFIG_B4860QDS)	+= eth_b4860qds.o
+obj-$(CONFIG_TARGET_B4860QDS)	+= eth_b4860qds.o
+obj-$(CONFIG_TARGET_B4420QDS)	+= eth_b4860qds.o
 obj-$(CONFIG_PCI)	+= pci.o
 endif