Move Mediatek/Ralink PCIe to NEW_PCIB

This revision fixes minor issues and moves the Mediatek/Ralink PCIe
support to use NEW_PCIB.

https://svnweb.freebsd.org/changeset/base/297849 is the other part of
this changeset.

Approved by: adrian (mentor)
Sponsored by: Smartcom - Bulgaria AD
Differential Revision: https://reviews.freebsd.org/D5908