Backport net: sntp: Add option for SNTP uncertainty #22
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SNTP response is not analyzed for uncertainty, and no uncertainty is given to the `struct sntp_time` returned. Fix it with a Kconfig option that adds optional SNTP uncertainty and timestamp fields in SNTP time struct, and calculates these when parsing the response. Adds two helper functions to convert Q16.16/Q32.32 in seconds to `int64_t` in microseconds to facilitate this. Also changes combined `lvm` field in `struct sntp_pkt` to bit-fields `li`, `vn`, and `mode`. Signed-off-by: Jasper Smit <[email protected]>
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Backport #66233 from zephyr: