[POWERPC] Fix build failure on Cell when CONFIG_SPU_FS=y

Commit aed3a8c9 introduced a
definition of notify_spus_active in .../cell/spu_syscalls.c, and
another definition under #ifndef MODULE in .../cell/spufs/sched.c.
The latter is not necessary and causes the build to fail when
CONFIG_SPU_FS=y, so this removes it.  It also removes the export
of do_notify_spus_active, which is unnecessary.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Jeremy Kerr <jk@ozlabs.org>

arch/powerpc/platforms/cell/spufs/sched.c

@@ -192,15 +192,6 @@ void do_notify_spus_active(void)
 		mutex_unlock(&cbe_spu_info[node].list_mutex);
 	}
 }
-EXPORT_SYMBOL_GPL(do_notify_spus_active);
-
-#ifndef MODULE
-void notify_spus_active(void)
-{
-	do_notify_spus_active();
-}
-EXPORT_SYMBOL_GPL(notify_spus_active);
-#endif
 
 /**
  * spu_bind_context - bind spu context to physical spu