iflib: remove the unused TX queue state machine
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Authored by netchild on Thu, Jul 16, 11:11 AM.

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	F163431181: D58282.id182076.diff
	Thu, Jul 23, 3:50 AM

	F163402646: D58282.diff
	Wed, Jul 22, 9:43 PM

	F163382420: D58282.id.diff
	Wed, Jul 22, 5:15 PM

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Reviewers

gallatin
kbowling
markj
erj
shurd

Group Reviewers

iflib

Summary

The previous commit stopped using ift_qstatus and the IFLIB_QUEUE_*
states for the TX watchdog decision, leaving only dead stores.
Remove the field, the states, and all assignments. Also remove
ift_cleaned_prev, whose last consumer was the old watchdog check.
No functional change.

MFC after: 1 month
Assisted-by: Claude Code (Fable 5)