Enable CONFIG_I2C_GPIO

- Enable the i2c-gpio driver.

Change-Id: I989b645be3ba296edcdd3d8e0aa4a200cfa4bc0f
diff --git a/debian/defconfig b/debian/defconfig
index 07487be..966aa18 100644
--- a/debian/defconfig
+++ b/debian/defconfig
@@ -210,6 +210,7 @@
 CONFIG_SERIAL_8250_MT6577=y
 CONFIG_HW_RANDOM=y
 CONFIG_I2C_CHARDEV=y
+CONFIG_I2C_GPIO=y
 CONFIG_I2C_MT65XX=y
 CONFIG_SPI=y
 CONFIG_SPI_MT65XX=y