ARM: dts: qcom: rename eth node to ethernet

Comply with dt-schema requirements.

Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220108171535.55536-1-david@ixit.cz