[media] em28xx: remove obsolete #define EM28XX_URB_TIMEOUT

It isn't used anymore and uses constants which no longer exist.
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/em28xx/em28xx.h

@@ -187,10 +187,6 @@
 			Interval: 125us
 */
 
-/* time to wait when stopping the isoc transfer */
-#define EM28XX_URB_TIMEOUT \
-			msecs_to_jiffies(EM28XX_NUM_BUFS * EM28XX_NUM_PACKETS)
-
 /* time in msecs to wait for i2c writes to finish */
 #define EM2800_I2C_WRITE_TIMEOUT 20