HWMON: applesmc - convert to use input-polldev

Switch to using input-polldev skeleton instead of implementing polling loop by
itself.  This also fixes problem with trylock on a mutex in atomic context.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 13eea47..f0ab2ac 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -623,6 +623,7 @@
 	depends on INPUT && X86
 	select NEW_LEDS
 	select LEDS_CLASS
+	select INPUT_POLLDEV
 	default n
 	help
 	  This driver provides support for the Apple System Management