Sub 1GHz Support for CC1352

[benediktibk]

Is this request related to a missing driver support for a particular hardware platform, SoC or board? Please describe.
For low power wireless applications support for the sub 1 GHz hardware of for instance the CC1352 would be very useful.
The corresponding evaluation board (Launchpad XL) is already supported by zephyr, only the wireless part is missing.

Describe why you are asking for this support?
We have a specific project which is using this chip and requires the sub 1GHz hardware of the chip to transfer data.

[github-actions]

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