ipq806x: utilize nvmem-cells for pre-calibration data

ipq806x: utilize nvmem-cells for pre-calibration data

converts extraction entries from 11-ath10k-caldata into
nvmem-cells in the individual board's device-tree file.

The patch also moves previously existing referenced
nvmem-cells data nodes which were placed at the end
back into the partitions node. As well as removing
some duplicated properties from qcom-ipq8065-xr500.dts's
art (the included nighthawk.dtsi defines those already).

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>