xilinx_spi: add a platform driver using the xilinx_spi common module.

This patch adds in a platform device driver using the xilinx_spi common module.

Tested-by: John Linn <John.Linn@xilinx.com>
Signed-off-by: Richard Röjfors <richard.rojfors@mocean-labs.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 01c4095..2f2bebc 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -33,6 +33,7 @@
 obj-$(CONFIG_SPI_TXX9)			+= spi_txx9.o
 obj-$(CONFIG_SPI_XILINX)		+= xilinx_spi.o
 obj-$(CONFIG_SPI_XILINX_OF)		+= xilinx_spi_of.o
+obj-$(CONFIG_SPI_XILINX_PLTFM)		+= xilinx_spi_pltfm.o
 obj-$(CONFIG_SPI_SH_SCI)		+= spi_sh_sci.o
 obj-$(CONFIG_SPI_STMP3XXX)		+= spi_stmp.o
 # 	... add above this line ...