arm64: dts: rockchip: Fix ethernet on production Quartz64-B

The production Quartz64 Model B has compatibility issues when using
rgmii-id mode. Switch to rgmii mode and use the SoC's delays to ensure
full compatibility.

Reported-by: Frank Mankel <frank.mankel@gmail.com>
Fixes: dcc8c66b ("arm64: dts: rockchip: add Pine64 Quartz64-B device tree")
Signed-off-by: Peter Geis <pgwipeout@gmail.com>
Tested-by: Frank Mankel <frank.mankel@gmail.com>
Link: https://lore.kernel.org/r/20220606163023.3677147-1-pgwipeout@gmail.com


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