arm: dts: Add mac node for rk3308 at dtsi level
The rk3308 only support RMII mode, and if it is output clock mode, better to use ref_clk pin with drive strength 12ma. Signed-off-by: NDavid Wu <david.wu@rock-chips.com> Reviewed-by: NKever Yang <kever.yang@rock-chips.com>
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