iio: inv_sensors: better timestamp alignment when using watermark

Current interrupt timestamp alignment only changes the final timestamp.
When the watermark is in use, we have a batch of samples for each
interrupt. The current code doesn't manage to align the timestamp
because the jitter is too high.

Instead modify the estimated inter interrupt period and use that to
adjust the timestamp alignment over the batch in a linear fashion.

Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

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