K 10
svn:author
V 3
zbb
K 8
svn:date
V 27
2016-01-28T15:44:14.355363Z
K 7
svn:log
V 429
Support new MDIO hierarchy in ThunderX DTB

Some firmware revisions provide different DTB tree that include
odd MDIO placement in the tree.
This commit adds support for 2 new buses:
- MRML bridge (PCIB subordinate)
- MDIO nexus (MRML subordinate)
This allows for the correct MDIO attachment with both - new and old
firmware.

Obtained from: Semihalf
Sponsored by:  Cavium
Differential Revision: https://reviews.freebsd.org/D5070

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