[frontend] update snr/db "GIGA DVB-T2/C NIM (TT3L10)" (#3451)

[GitHub]

[frontend] update snr/db "GIGA DVB-T2/C NIM (TT3L10)" (#3451)

-dual plug & play tuner GB UE/Quad UHD 4K

(cherry picked from commit 67a8121d26368092ca77a29c2ffd300dc09f58c2)

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