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urtwn(4): move duplicate code from urtwn_(r92c/r88e)_dma_init()

Description

urtwn(4): move duplicate code from urtwn_(r92c/r88e)_dma_init()
to urtwn_dma_init() (noop).

Reviewed by: kevlo
Approved by: adrian (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D4271