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Remove unneeded initialization in mtk_xhci.c

Description

Remove unneeded initialization in mtk_xhci.c

This is actually initialized properly within xhci.c, so it's better to
not initialize it in mtk_xhci.c

Approved by: adrian (mentor)
Sponsored by: Smartcom - Bulgaria AD
Differential Revision: https://reviews.freebsd.org/D5935