tracing: fix txctl handling
tracing: fix txctl handling

txctl log type manipulates pktlog header and log data as well. payload
length should be handled differently for 10.2 and 10.4 based firmware.
Not doing so, will generate invalid pktlog data file.

qca/qca-swiss-army-knife,qca/qca-swiss-army-knife,qca/qca-swiss-army-knife,qca/qca-swiss-army-knife