arm64: dts: meson: add ethernet interrupt to wetek dtsi

Add Ethernet interrupt details to the WeTek Hub/Play2 dtsi to resolve
an issue with Ethernet probing in mainline u-boot.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20200518025451.16401-1-christianshewitt@gmail.com