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/Lamobo_R1_defconfig b/configs/Lamobo_R1_defconfig
index d949f55..a250875 100644
--- a/configs/Lamobo_R1_defconfig
+++ b/configs/Lamobo_R1_defconfig
@@ -12,6 +12,7 @@
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL_I2C=y
 CONFIG_SCSI_AHCI=y
+CONFIG_SYS_I2C_MVTWSI=y
 CONFIG_B53_SWITCH=y
 CONFIG_B53_PHY_PORTS=0x1f
 CONFIG_PHY_REALTEK=y