MX6: fix sata compilation for i.MX6

Commit 164d98466103a46b7c881149e92ec2a28a6375be breaks
board with SATA support, because sata is not compiled.

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/arch/arm/imx-common/Makefile b/arch/arm/imx-common/Makefile
index 68f0f52..ee5c872 100644
--- a/arch/arm/imx-common/Makefile
+++ b/arch/arm/imx-common/Makefile
@@ -18,7 +18,7 @@
 obj-y	+= misc.o
 endif
 ifeq ($(SOC),$(filter $(SOC),mx6))
-objs-$(CONFIG_CMD_SATA) += sata.o
+obj-$(CONFIG_CMD_SATA) += sata.o
 endif
 obj-$(CONFIG_CMD_BMODE) += cmd_bmode.o
 obj-$(CONFIG_CMD_HDMIDETECT) += cmd_hdmidet.o