arm64: dts: qcom: sa8775p-ride: add an alias for ethernet0

Once we add a second ethernet node, the MDIO bus names will conflict
unless we provide aliases. Add one for the existing ethernet node.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Andrew Halaney <ahalaney@redhat.com>
Link: https://lore.kernel.org/r/20230810080909.6259-9-brgl@bgdev.pl


Signed-off-by: Bjorn Andersson <andersson@kernel.org>