ARM: dts: rockchip: add the panel power supply for rk3288-evb board with act8846 pmu

Panel regulator is controller by a normal GPIO, so we need to
write a regulator-fixed node for it.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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