dt/spi: Eliminate users of of_platform_{,un}register_driver

Get rid of users of of_platform_driver in drivers/spi.  The
of_platform_{,un}register_driver functions are going away, so the
users need to be converted to using the platform_bus_type directly.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/spi_fsl_lib.c b/drivers/spi/spi_fsl_lib.c
index 5cd741f..ff59f42 100644
--- a/drivers/spi/spi_fsl_lib.c
+++ b/drivers/spi/spi_fsl_lib.c
@@ -189,8 +189,7 @@
 	return 0;
 }
 
-int __devinit of_mpc8xxx_spi_probe(struct platform_device *ofdev,
-					const struct of_device_id *ofid)
+int __devinit of_mpc8xxx_spi_probe(struct platform_device *ofdev)
 {
 	struct device *dev = &ofdev->dev;
 	struct device_node *np = ofdev->dev.of_node;