hso: remove useless header file timer.h

No timer related function is used in this driver.
Signed-off-by: NOlivier Sobrie <olivier@sobrie.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/usb/hso.c

@@ -58,7 +58,6 @@
 #include <linux/module.h>
 #include <linux/ethtool.h>
 #include <linux/usb.h>
-#include <linux/timer.h>
 #include <linux/tty.h>
 #include <linux/tty_driver.h>
 #include <linux/tty_flip.h>