spi: davinci: Update configs to make it selectable on Keystone

Keystone2 SOCs share the SPI IP block with DaVinci based SOCs. Update
the config bits so that its usable on Keystone2 based SOCs.
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: NMark Brown <broonie@linaro.org>

drivers/spi/Kconfig

@@ -151,7 +151,7 @@ config SPI_COLDFIRE_QSPI
 
 config SPI_DAVINCI
 	tristate "Texas Instruments DaVinci/DA8x/OMAP-L/AM1x SoC SPI controller"
-	depends on ARCH_DAVINCI
+	depends on ARCH_DAVINCI || ARCH_KEYSTONE
 	select SPI_BITBANG
 	select TI_EDMA
 	help