i2c: add support for MediaTek I2C interface

This patch adds support for MediaTek I2C interface

Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 7e046f8..920aafb 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -32,6 +32,7 @@
 obj-$(CONFIG_SYS_I2C_MV) += mv_i2c.o
 obj-$(CONFIG_SYS_I2C_MVTWSI) += mvtwsi.o
 obj-$(CONFIG_SYS_I2C_MXC) += mxc_i2c.o
+obj-$(CONFIG_SYS_I2C_MTK) += mtk_i2c.o
 obj-$(CONFIG_SYS_I2C_NEXELL) += nx_i2c.o
 obj-$(CONFIG_SYS_I2C_NPCM) += npcm_i2c.o
 obj-$(CONFIG_SYS_I2C_OCORES) += ocores_i2c.o