arm64: defconfig: Enable I2C_GPIO

The GPIO-based bitbanging I2C driver is required to configure
CSI data, clock pins on CSI block in Allwinner A64 SoC.

Let build it as module.
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>
Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com>

arch/arm64/configs/defconfig

@@ -339,6 +339,7 @@ CONFIG_I2C_MUX=y
 CONFIG_I2C_MUX_PCA954x=y
 CONFIG_I2C_BCM2835=m
 CONFIG_I2C_DESIGNWARE_PLATFORM=y
+CONFIG_I2C_GPIO=m
 CONFIG_I2C_IMX=y
 CONFIG_I2C_MESON=y
 CONFIG_I2C_MV64XXX=y