mtd: Build nand_util.o for CONFIG_ENV_IS_IN_NAND in SPL

Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 02b149c..4eb354d 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -18,6 +18,9 @@
 obj-$(CONFIG_SPL_NAND_ECC) += nand_ecc.o
 obj-$(CONFIG_SPL_NAND_BASE) += nand_base.o
 obj-$(CONFIG_SPL_NAND_INIT) += nand.o
+ifeq ($(CONFIG_SPL_ENV_SUPPORT),y)
+obj-$(CONFIG_ENV_IS_IN_NAND) += nand_util.o
+endif
 
 else # not spl