dt-bindings: net: qcom,ethqos: Document SM8150 SoC compatible

SM8150 has an ethernet controller and it needs a different
configuration, so add a new compatible for this.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
[bhsharma: Massage the commit log]
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Link: https://lore.kernel.org/r/20220325200731.1585554-1-bhupesh.sharma@linaro.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>