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/CHIP_defconfig b/configs/CHIP_defconfig
index 5347d32..c245ba9 100644
--- a/configs/CHIP_defconfig
+++ b/configs/CHIP_defconfig
@@ -10,6 +10,7 @@
 CONFIG_SPL_I2C=y
 CONFIG_CMD_DFU=y
 CONFIG_DFU_RAM=y
+CONFIG_SYS_I2C_MVTWSI=y
 # CONFIG_MMC is not set
 CONFIG_AXP_ALDO3_VOLT=3300
 CONFIG_AXP_ALDO4_VOLT=3300