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/ioctl.h b/libc/include/sys/ioctl.h
index efbcb0c..76dc1ff 100644
--- a/libc/include/sys/ioctl.h
+++ b/libc/include/sys/ioctl.h
@@ -25,6 +25,7 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #ifndef _SYS_IOCTL_H_
 #define _SYS_IOCTL_H_
 
@@ -41,4 +42,4 @@
 
 #include <bits/ioctl.h>
 
-#endif /* _SYS_IOCTL_H_ */
+#endif