cros: add I2C support for cros_ec

This patch adds I2C support for carrying out the cros_ec protocol.

Signed-off-by: Randall Spangler <rspangler@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Hung-ying Tyan <tyanh@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 1016dde..51e59a6 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -29,6 +29,7 @@
 COBJS-$(CONFIG_DS4510)  += ds4510.o
 COBJS-$(CONFIG_CBMEM_CONSOLE) += cbmem_console.o
 COBJS-$(CONFIG_CROS_EC) += cros_ec.o
+COBJS-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o
 COBJS-$(CONFIG_FSL_IIM) += fsl_iim.o
 COBJS-$(CONFIG_GPIO_LED) += gpio_led.o
 COBJS-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o