add freq information

[javierbrk]

This pull request addresses the lack of frequency information in wifi links info module
The module has been tested with two very close tplinks
and this is the output

{"primero":{"bleachTTL":30,"data":[{"tx_rate":135000,"dst_mac":"A0:F3:C1:46:28:97","signal":-61,"chains":[-63,-64],"freq":5240,"rx_rate":216000,"src_mac":"a8:40:41:1d:f9:35"},{"tx_rate":135000,"dst_mac":"14:CC:20:DA:4E:AC","signal":-50,"chains":[-50,-62],"freq":5240,"rx_rate":180000,"src_mac":"a8:40:41:1d:f9:35"}],"author":"primero"},"LiMe-da4eaa":{"bleachTTL":30,"data":[{"tx_rate":86700,"dst_mac":"A0:F3:C1:46:28:96","signal":-23,"chains":[-23,-45],"freq":2462,"rx_rate":72200,"src_mac":"14:cc:20:da:4e:ab"},{"tx_rate":270000,"dst_mac":"A0:F3:C1:46:28:97","signal":-49,"chains":[-59,-49],"freq":5240,"rx_rate":300000,"src_mac":"14:cc:20:da:4e:ac"},{"tx_rate":150000,"dst_mac":"A8:40:41:1D:F9:35","signal":-64,"chains":[-74,-64],"freq":5240,"rx_rate":135000,"src_mac":"14:cc:20:da:4e:ac"}],"author":"LiMe-da4eaa"},"LiMe-462895":{"bleachTTL":28,"data":[{"tx_rate":72200,"dst_mac":"14:CC:20:DA:4E:AB","signal":5,"chains":[5,-32],"freq":2462,"rx_rate":65000,"src_mac":"a0:f3:c1:46:28:96"},{"tx_rate":240000,"dst_mac":"A8:40:41:1D:F9:35","signal":-66,"chains":[-74,-67],"freq":5240,"rx_rate":135000,"src_mac":"a0:f3:c1:46:28:97"},{"tx_rate":300000,"dst_mac":"14:CC:20:DA:4E:AC","signal":-42,"chains":[-53,-42],"freq":5240,"rx_rate":270000,"src_mac":"a0:f3:c1:46:28:97"}],"author":"LiMe-462895"}}

[codecov-commenter]

Codecov Report

Merging #1045 (b6b0d38) into master (e6f4774) will not change coverage.
The diff coverage is n/a.

❗ Current head b6b0d38 differs from pull request most recent head fb8432f. Consider uploading reports for the commit fb8432f to get more accurate results

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@@           Coverage Diff           @@
##           master    #1045   +/-   ##
=======================================
  Coverage   79.71%   79.71%           
=======================================
  Files          53       53           
  Lines        4536     4536           
=======================================
  Hits         3616     3616           
  Misses        920      920           

see 1 file with indirect coverage changes

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