arm64: dts: meson-sm1-odroid: add 5v regulator gpio

As described in the Odroid-C4 & Odroid-HC4 schematics, the 5V regulator is controlled
by GPIOH_8 and in Open Drain since this GPIO doesn't support Push-Pull.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20210607065435.577334-4-narmstrong@baylibre.com