arm64: dts: rockchip: change eth phy mode to rgmii-id for orangepi r1 plus lts

In general the delay should be added by the PHY instead of the MAC,
and this improves network stability on some boards which seem to
need different delay.

Fixes: 387b3bba ("arm64: dts: rockchip: Add Xunlong OrangePi R1 Plus LTS")
Cc: stable@vger.kernel.org # 6.6+
Signed-off-by: Tianling Shen <cnsztl@gmail.com>
Link: https://lore.kernel.org/r/20250119091154.1110762-1-cnsztl@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>