ARM: dts: owl-s500: Add ethernet support

Add Ethernet MAC device tree node for Actions Semi S500 SoC.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/222ee0c2cb431619f558dce9726585ac92f65e00.1623401998.git.cristian.ciocaltea@gmail.com
Link: https://lore.kernel.org/r/20210628072817.8269-2-mani@kernel.org

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>