Merge branch 'net-stmmac-dwmac-meson-100M-phy-mode-support-for-AXG-SoC'

Yixun Lan says:

====================
net: stmmac: dwmac-meson: 100M phy mode support for AXG SoC

Due to the dwmac glue layer register changed, we need to
introduce a new compatible name for the Meson-AXG SoC
to support for the RMII 100M ethernet PHY.

Change since v1 at [1]:
  - implement set_phy_mode() for each SoC

[1] https://lkml.kernel.org/r/20180426160508.29380-1-yixun.lan@amlogic.com


====================

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