net: usb: Fix memory leak on Tx data path

Cherry picked from 673e1f276a71065638da2dd7f431b630e9d414f4

Driver anchors the tx urbs and defers the urb submission if
a transmit request comes when the interface is suspended.
Anchoring urb increments the urb reference count. These
deferred urbs are later accessed by calling usb_get_from_anchor()
for submission during interface resume. usb_get_from_anchor()
unanchors the urb but urb reference count remains same.
This causes the urb reference count to remain non-zero
after usb_free_urb() gets called and urb never gets freed.
Hence call usb_put_urb() after anchoring the urb to properly
balance the reference count for these deferred urbs. Also,
unanchor these deferred urbs during disconnect, to free them
up.

CRs-Fixed: 408145
Change-Id: If37b2f63da4ed20796cc8f3be6e64d15149c6cea
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>