Integrate meta-seconorth-machine/speadspectrum-memtool_new

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Commit: seco-ne/yocto/layers/meta-seconorth-machine@58877c7f

spreadspectrum.py: Allow to use memtool for register access, install for mx8

seco-mx8: Fix override for spreadspectrum script

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Commit: seco-ne/yocto/layers/meta-seconorth-machine@d4bc4b5f

bsp:tools: Added memtool from imx-test

Added an extracted version of the memtool for reading/writing registers
of i.MX SoCs.