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/spi_imx.c b/drivers/spi/spi_imx.c
index 1b06471..d4ba640 100644
--- a/drivers/spi/spi_imx.c
+++ b/drivers/spi/spi_imx.c
@@ -1722,10 +1722,12 @@
 #define spi_imx_resume NULL
 #endif /* CONFIG_PM */
 
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:spi_imx");
+
 static struct platform_driver driver = {
 	.driver = {
 		.name = "spi_imx",
-		.bus = &platform_bus_type,
 		.owner = THIS_MODULE,
 	},
 	.remove = __exit_p(spi_imx_remove),