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/A20-OLinuXino-Lime2-eMMC_defconfig b/configs/A20-OLinuXino-Lime2-eMMC_defconfig
index 3936da1..4956104 100644
--- a/configs/A20-OLinuXino-Lime2-eMMC_defconfig
+++ b/configs/A20-OLinuXino-Lime2-eMMC_defconfig
@@ -19,6 +19,7 @@
 CONFIG_SCSI_AHCI=y
 CONFIG_DFU_RAM=y
 CONFIG_FASTBOOT_CMD_OEM_FORMAT=y
+CONFIG_SYS_I2C_MVTWSI=y
 CONFIG_PHY_MICREL=y
 CONFIG_PHY_MICREL_KSZ90X1=y
 CONFIG_PHY_REALTEK=y