ARM: config: aspeed-g5: Enable I2C GPIO mux driver

Used by rainier and q71l.
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/configs/aspeed_g5_defconfig

@@ -147,6 +147,7 @@ CONFIG_HW_RANDOM_TIMERIOMEM=y
 # CONFIG_I2C_COMPAT is not set
 CONFIG_I2C_CHARDEV=y
 CONFIG_I2C_MUX=y
+CONFIG_I2C_MUX_GPIO=y
 CONFIG_I2C_MUX_PCA9541=y
 CONFIG_I2C_MUX_PCA954x=y
 CONFIG_I2C_ASPEED=y