Ethernet devices are cache coherent, mark it as such in the dtsi.
Fixes: ff499a0fbb23 ("arm64: dts: qcom: sa8775p: add the first 1Gb ethernet interface")
Fixes: e952348a7cc7 ("arm64: dts: qcom: sa8775p: add a node for EMAC1")
Signed-off-by: Sagar Cheluvegowda <quic_scheluve@xxxxxxxxxxx>
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