usb: dwc3: gadget: Simplify TRB reclaim logic by removing redundant 'chain' argument

usb: dwc3: gadget: Simplify TRB reclaim logic by removing redundant 'chain' argument

Now that the TRB reclaim logic always inspects the TRB's CHN (Chain) bit
directly to determine whether a TRB is part of a chain, the explicit
'chain' parameter passed into dwc3_gadget_ep_reclaim_completed_trb()
is no longer necessary.

This cleanup simplifies the reclaim code by avoiding duplication of
chain state tracking, and makes the reclaim logic rely entirely on the
hardware descriptor flags — which are already present and accurate at
this stage.

No functional changes intended.

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Johannes Schneider <johannes.schneider@leica-geosystems.com>
Link: https://lore.kernel.org/r/20250629090414.294308-2-johannes.schneider@leica-geosystems.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>