ARM: imx_v6_v7_defconfig: Enable SPI_GPIO

Some boards like imx7d-sdb provide SPIO functionality via GPIOs,
so enable the CONFIG_SPI_GPIO option.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -193,6 +193,7 @@ CONFIG_I2C_ALGOPCA=m
 CONFIG_I2C_GPIO=y
 CONFIG_I2C_IMX=y
 CONFIG_SPI=y
+CONFIG_SPI_GPIO=y
 CONFIG_SPI_IMX=y
 CONFIG_SPI_FSL_DSPI=y
 CONFIG_GPIO_SYSFS=y