gstreamer: Move timestamp calculation out of pad loop

The buffer pts and the pad latency are computed from the framebuffer
timestamp, separately for each pad. Use the sensor timestamp provided
through the request metadata instead, to compute the values once outside
of the pads loop.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

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