spi: fix platform driver hotplug/coldplug

Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is
prefixed with "platform:".  Add MODULE_ALIAS() to the hotpluggable SPI
platform drivers, to allow module auto loading.

[dbrownell@users.sourceforge.net: more drivers: registration fixes]
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c
index 5d04f52..cf6aef3 100644
--- a/drivers/spi/xilinx_spi.c
+++ b/drivers/spi/xilinx_spi.c
@@ -408,6 +408,9 @@
 	return 0;
 }
 
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:" XILINX_SPI_NAME);
+
 static struct platform_driver xilinx_spi_driver = {
 	.probe	= xilinx_spi_probe,
 	.remove	= __devexit_p(xilinx_spi_remove),