ARM: dts: ux500: Add Flash LEDs to Samsung phones

This adds the Richtek RT8515 Flash LED to the Golden,
Skomer and Janice device trees.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20210201091308.284465-1-linus.walleij@linaro.org

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