rtc: simplified rtc sysfs attribute handling

This simplifies the RTC sysfs support by removing the class_interface that
hooks it into the rtc core.  If it's configured, then sysfs support is now
part of the RTC core, and is never a separate module.

It's another step towards being able to remove "struct class_device".

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-By: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 4820dcc..37bb9ce 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -12,8 +12,8 @@
 rtc-core-y			:= class.o interface.o
 
 rtc-core-$(CONFIG_RTC_INTF_DEV)	+= rtc-dev.o
+rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
 
-obj-$(CONFIG_RTC_INTF_SYSFS)	+= rtc-sysfs.o
 obj-$(CONFIG_RTC_INTF_PROC)	+= rtc-proc.o
 
 obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o