spi: atmel: default y if DM_SPI && ARCH_AT91

ATMEL_SPI is now fully converted to driver-model and
respective boards switch to DM_SPI as well,
so make default y for ARCH_AT91

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Wenyou Yang <wenyouya@gmail.com>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index a3b4a0b..12dde8f 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -41,7 +41,7 @@
 
 config ATMEL_SPI
 	bool "Atmel SPI driver"
-	depends on ARCH_AT91
+	default y if ARCH_AT91
 	help
 	  This enables driver for the Atmel SPI Controller, present on
 	  many AT91 (ARM) chips. This driver can be used to access