usb: usb_bam: Don't wait for consumer request on disconnect pipes

On concurrency scenario consumer is released only after
teth_bridge_disconnect(). This function is only called later
in the disconnect sequence. This cause unnecessary delay of
the disconnect sequnce which can be problematic if the
usb cable is connected back within 10 sec.

Change-Id: Ice2dfed217b695a71c636a115f8e0d856b4bf96e
CRs-Fixed: 500462
Signed-off-by: Bar Weiner <bweiner@codeaurora.org>