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Add FEC error counters.

Merged Frans Schreuder requested to merge phase2/FLX-1954_FEC_ERR_CNT_LPGBT into phase2/master

Implemented FEC error counters for lpGBT channels.

  • If more than one FEC error occurs in one clock cycle, all errors are counted
  • The counter is 32b, but overflows and rolls back to 0
  • The counter is reset when the lpGBT alignment is false

FEC error counter now counts in 4 pipeline stages, starting by 10 groups of 23 bits, then add 5 values in 2 counters, then add the 2 counters, then increment the 32b counter by that value.

Closes FLX-1954

Edited by Frans Schreuder

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