ARM: dts: add Nuvoton NPCM730 device tree

Add Nuvoton NPCM730 SoC device tree.

The Nuvoton NPCN730 SoC is a part of the
Nuvoton NPCM7xx SoCs family.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Reviewed-by: Benjamin Fair <benjaminfair@google.com>
Link: https://lore.kernel.org/r/20201119080002.100342-1-tmaimon77@gmail.com

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