cmake: sysbuild: fast_pair: add support for DTS-based memory maps

[kapi-no]

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[NordicBuilder]

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[kapi-no]

Depends on the following PR:

#16425

[kapi-no]

The Fast Pair Input Device sample seems to work with this prototype solution. However, I need to improve the way the Fast Pair provisioning data hex is integrated into the final uicr_merged.hex. We need some form of a merge hex coordinator for this improvement (e.g. the one that was suggested in #16425).

[NordicBuilder]

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[kapi-no]

Merged as part of the following PR:

#18792