usb: gadget: udc: bdc: make use of new usb_endpoint_maxp_mult()

We have introduced a helper to calculate multiplier
value from wMaxPacketSize. Start using it.

Cc: Ashwini Pahuja <ashwini.linux@gmail.com>
Cc: <linux-usb@vger.kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/bdc/bdc_cmd.c

@@ -182,7 +182,7 @@ int bdc_config_ep(struct bdc *bdc, struct bdc_ep *ep)
 					usb_endpoint_xfer_int(desc)) {
 			param2 |= si;
 
-			mbs = (usb_endpoint_maxp(desc) & 0x1800) >> 11;
+			mbs = usb_endpoint_maxp_mult(desc);
 			param2 |= mbs << MB_SHIFT;
 		}
 		break;