ARM: at91: at91_dt_defconfig: enable WILC SPI driver

Enable WILC SPI driver as a module.

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

Author: cristibirsan

arch/arm/configs/at91_dt_defconfig

@@ -215,6 +215,7 @@ CONFIG_AT_HDMAC=y
 CONFIG_AT_XDMAC=y
 CONFIG_STAGING=y
 CONFIG_WILC_SDIO=m
+CONFIG_WILC_SPI=m
 CONFIG_MICROCHIP_PIT64B=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_IIO=y