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: Ibced4127bb171076da0eeca3aed07eb1d8739762
Signed-off-by: Anson Jacob <ansonjacob.aj@gmail.com>