Merge branch 'stmmac-RK3568'

Ezequiel Garcia says:

====================
stmmmac: RK3568

Here's the third version of this patchset, taking
the feedback from Heiko and Chen-Yu Tsai.

Although this solution is a tad ugly as it hardcodes
the register addresses, we believe it's the most robust approach.

See:

https://lore.kernel.org/netdev/CAGb2v67ZBR=XDFPeXQc429HNu_dbY__-KN50tvBW44fXMs78_w@mail.gmail.com/

This is tested on RK3566 EVB2 and seems to work well.
Once the RK3568 devicetree lands upstream, we'll post
patches to add network support for RK3566 and RK3568.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>