USB: Remove the duplicate definition of HUB_SET_DEPTH

The macro HUB_SET_DEPTH is defined twice in ch11.h (introduced by
commit 0eadcc09 "usb: USB3.0 ch11 definitions" and dbe79bbe "USB 3.0
Hub Changes"), so remove the duplicate one in the USB 2.0 part.
Signed-off-by: NQinglin Ye <yestyle@gmail.com>
Cc: John Youn <John.Youn@synopsys.com>
Cc: Sergei Shtylyov <sshtylyov@mvista.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

include/linux/usb/ch11.h

@@ -26,7 +26,6 @@
 #define HUB_RESET_TT		9
 #define HUB_GET_TT_STATE	10
 #define HUB_STOP_TT		11
-#define HUB_SET_DEPTH		12
 
 /*
  * Hub class additional requests defined by USB 3.0 spec