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ath: Revert "Use NET_TASK_INIT() and NET_GROUPTASK_INIT() for drivers that…

Description

ath: Revert "Use NET_TASK_INIT() and NET_GROUPTASK_INIT() for drivers that process"

This reverts commit 6c3e93cb5a4aa4b8a2d8d4d326f2a7c34d3a4458 for
sys/dev/ath/if_ath.c only.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit 82506f26c03aa312b91e01a797f31e061749a76d)