Merge branch 'RTL8211E-RGMII-D'

Kunihiko Hayashi says:

====================
Change phy-mode to RGMII-ID to enable delay pins for RTL8211E

UniPhier PXs2, LD20, and PXs3 boards have RTL8211E ethernet phy, and the
phy have the RX/TX delays of RGMII interface using pull-ups on the RXDLY
and TXDLY pins.

After the commit bbc4d71d ("net: phy: realtek: fix rtl8211e rx/tx
delay config"), the delays are working correctly, however, "rgmii" means
no delay and the phy doesn't work. So need to set the phy-mode to
"rgmii-id" to show that RX/TX delays are enabled.

Changes since v1:
- Fix the commit message
====================

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