ARM: at91: at91_dt_defconfig: set SPIDEV as a module

Set SPIDEV as a module to be in sync with sama5_defconfig.

Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>

Author: cristibirsan

arch/arm/configs/at91_dt_defconfig

@@ -132,7 +132,7 @@ CONFIG_SPI=y
 CONFIG_SPI_ATMEL=y
 CONFIG_SPI_ATMEL_QUADSPI=y
 CONFIG_SPI_GPIO=y
-CONFIG_SPI_SPIDEV=y
+CONFIG_SPI_SPIDEV=m
 CONFIG_PINCTRL_MCP23S08=m
 CONFIG_GPIO_SYSFS=y
 CONFIG_GPIO_PCA953X=m