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fix focus control for the dw9714 vcm

Martin Kepplinger requested to merge martin.kepplinger/megapixels:focus_fix into master

the datasheet says there are 10bit available at D[13:4]. the rest is to configure the stepping and power.

the behaviour with default value 0 is as I would expect it to be, with the focus being at "normal" distances. high values move the focus nearer.

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