misc: fix platform driver hotplug/coldplug

Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is
prefixed with "platform:".  Add MODULE_ALIAS() to the hotpluggable 'misc'
platform drivers, to re-enable auto loading.

[dbrownell@users.sourceforge.net:  bugfix, 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/misc/atmel_pwm.c b/drivers/misc/atmel_pwm.c
index f8d3b9a..0d5ce03 100644
--- a/drivers/misc/atmel_pwm.c
+++ b/drivers/misc/atmel_pwm.c
@@ -407,3 +407,4 @@
 
 MODULE_DESCRIPTION("Driver for AT32/AT91 PWM module");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel_pwm");