usb: gadget: f_accessory: remove duplicate endpoint alloc

usb_ep_autoconfig is called twice for allocating
bulk out endpoint.

Removed the unwanted call.

Fixes Issue: 67180

Change-Id: I03e87a86fbbbc85831ff7f0496adf038d1de2956
Signed-off-by: Anson Jacob <ansonjacob.aj@gmail.com>