powerpc: p1022ds: Enable P1022DS to boot from SD Card with SPL

Enable p1022ds to start from eSDHC with SPL.

Signed-off-by: Ying Zhang <b40530@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/p1022ds/Makefile b/board/freescale/p1022ds/Makefile
index cfc05f7..3bc4f43 100644
--- a/board/freescale/p1022ds/Makefile
+++ b/board/freescale/p1022ds/Makefile
@@ -21,6 +21,9 @@
 COBJS-y        += spl_minimal.o tlb.o law.o
 
 else
+ifdef CONFIG_SPL_BUILD
+COBJS-y += spl.o
+endif
 COBJS-y	+= $(BOARD).o
 COBJS-y	+= ddr.o
 COBJS-y	+= law.o