Convert CONFIG_SYS_I2C_MVTWSI to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_I2C_MVTWSI

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/teres_i_defconfig b/configs/teres_i_defconfig
index 41d3474..7115865 100644
--- a/configs/teres_i_defconfig
+++ b/configs/teres_i_defconfig
@@ -9,6 +9,7 @@
 CONFIG_USB1_VBUS_PIN="PL7"
 CONFIG_I2C0_ENABLE=y
 CONFIG_PREBOOT="setenv usb_pgood_delay 2000; usb start"
+CONFIG_SYS_I2C_MVTWSI=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_DM_PWM=y