blackfin: serial: bfin-uart: remove unused field

Remove unused field for hardware flow control.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>

arch/blackfin/include/asm/bfin_serial.h

@@ -51,9 +51,6 @@ struct bfin_serial_port {
 #elif ANOMALY_05000363
 	unsigned int anomaly_threshold;
 #endif
-#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
-	int scts;
-#endif
 #if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
 	defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
 	int cts_pin;