Name function arguments in libc headers for Studio.

Second batch of headers...

Bug: http://b/64613623
Test: builds
Change-Id: I8eef043dbf32afee8ff814e9d005f46aee8fa21f
diff --git a/libc/include/sys/cachectl.h b/libc/include/sys/cachectl.h
index 5b20c19..9235327 100644
--- a/libc/include/sys/cachectl.h
+++ b/libc/include/sys/cachectl.h
@@ -34,4 +34,4 @@
 #include <asm/cachectl.h>
 #endif
 
-#endif /* sys/cachectl.h */
+#endif