[BRIDGE]: Remove unused include of a header file in ebtables.c

In net/bridge/netfilter/ebtables.c,
- remove unused include of a header file (linux/tty.h) and remove the
  corresponding comment above it.
Signed-off-by: NRami Rosen <ramirose@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/bridge/netfilter/ebtables.c

@@ -15,8 +15,6 @@
  *  2 of the License, or (at your option) any later version.
  */
 
-/* used for print_string */
-#include <linux/tty.h>
 
 #include <linux/kmod.h>
 #include <linux/module.h>