Convert autosuspend_wakeup_count.c to cpp

Change this file to cpp before cleaning it up.

Bug: 70669809
Test:  Suspend works
Change-Id: Ice927dbb205447a94f33b417e32f7c2cd79613eb
diff --git a/libsuspend/autosuspend_ops.h b/libsuspend/autosuspend_ops.h
index 2f435d9..357b828 100644
--- a/libsuspend/autosuspend_ops.h
+++ b/libsuspend/autosuspend_ops.h
@@ -23,6 +23,8 @@
     void (*set_wakeup_callback)(void (*func)(bool success));
 };
 
+__BEGIN_DECLS
 struct autosuspend_ops *autosuspend_wakeup_count_init(void);
+__END_DECLS
 
 #endif