ARM: dts: exynos: add charger supply for I9100

The regulator is used for charging control by max8997_charger driver on
GT-I9100 phone.

Signed-off-by: Timon Baetz <timon.baetz@protonmail.com>
Link: https://lore.kernel.org/r/20210130172747.2022977-3-timon.baetz@protonmail.com


Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>