ARM: imx_v6_v7_defconfig: Select CONFIG_GPIO_MAX732X by default

Enable max7320 IO expander for i.MX platforms.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -203,6 +203,7 @@ CONFIG_SPI_GPIO=y
 CONFIG_SPI_IMX=y
 CONFIG_SPI_FSL_DSPI=y
 CONFIG_GPIO_SYSFS=y
+CONFIG_GPIO_MAX732X=y
 CONFIG_GPIO_MC9S08DZ60=y
 CONFIG_GPIO_PCA953X=y
 CONFIG_GPIO_STMPE=y