imx-common: add i2c.c for bus recovery support

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
diff --git a/arch/arm/cpu/armv7/imx-common/Makefile b/arch/arm/cpu/armv7/imx-common/Makefile
index 53296fa..bf36be5 100644
--- a/arch/arm/cpu/armv7/imx-common/Makefile
+++ b/arch/arm/cpu/armv7/imx-common/Makefile
@@ -27,7 +27,9 @@
 
 LIB     = $(obj)libimx-common.o
 
-COBJS	= iomux-v3.o timer.o cpu.o speed.o
+COBJS-y	= iomux-v3.o timer.o cpu.o speed.o
+COBJS-$(CONFIG_I2C_MXC) += i2c.o
+COBJS	:= $(sort $(COBJS-y))
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))