spi: convert spi-bfin-v3.c to a multiplatform driver

Spi v3 controller is not only used on Blackfin. So rename it
and use ioread/iowrite api to make it work on other platform.

Signed-off-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 60f2b41..a52e0ed 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -91,8 +91,8 @@
 	help
 	  This is the SPI controller master driver for Blackfin 5xx processor.
 
-config SPI_BFIN_V3
-	tristate "SPI controller v3 for Blackfin"
+config SPI_ADI_V3
+	tristate "SPI controller v3 for ADI"
 	depends on BF60x
 	help
 	  This is the SPI controller v3 master driver