[meta-xilinx] Hack for Zedboard device tree

[Philip Balister]

I have to use the following commit so the zedboard can find the phy :

https://github.com/balister/meta-xilinx/commit/d386c81634b39b23242e33f7ecea77f521c120a5

Does anyone understand why this needs to be done. Multiple people seem
to have this issue.

Philip