of/spi: call of_register_spi_devices() from spi core code

Move of_register_spi_devices() call from drivers to
spi_register_master(). Also change the function to use
the struct device_node pointer from master spi device
instead of passing it as function argument.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/mpc512x_psc_spi.c b/drivers/spi/mpc512x_psc_spi.c
index 2534b1e..1bb4315 100644
--- a/drivers/spi/mpc512x_psc_spi.c
+++ b/drivers/spi/mpc512x_psc_spi.c
@@ -440,6 +440,7 @@
 	master->setup = mpc512x_psc_spi_setup;
 	master->transfer = mpc512x_psc_spi_transfer;
 	master->cleanup = mpc512x_psc_spi_cleanup;
+	master->dev.of_node = dev->of_node;
 
 	tempp = ioremap(regaddr, size);
 	if (!tempp) {