Blackfin: add driver for on-chip SPI controller

This fills out the SPI backend for the Blackfin on-chip SPI peripheral.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 15e0f7a..6e2c121 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -26,6 +26,7 @@
 LIB	:= $(obj)libspi.a
 
 COBJS-$(CONFIG_ATMEL_SPI) += atmel_spi.o
+COBJS-$(CONFIG_BFIN_SPI) += bfin_spi.o
 COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
 COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o
 COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o