arm64: dts: meson: nanopi-k2: readd PHY reset properties

arm64: dts: meson: nanopi-k2: readd PHY reset properties

The sync of device-tree/bindings in 11a48a5a18c6 ("Linux 5.6-rc2") causes
Ethernet to break on some GXBB boards; the PHY seems to need proper reset
timing to function in u-boot and Linux. Re-add the old PHY reset binding
for dwmac until we support new bindings in the PHY node. This borrows the
same fix applied to the Odroid C2 board [0].

[0] https://lists.denx.de/pipermail/u-boot/2021-April/446658.html

Fixes: dd5f2351e99a ("arm64: dts: meson: sync dt and bindings from v5.6-rc2")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20221025143205.14470-1-christianshewitt@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>