arm64: dts: rk3399-puma: fix gpio levels for vcc5v0-host regulator

The regulator enable-gpio uses opposite values for the declaration
vs. the enable_active_low property, breaking the regulator enablement.

Make the usbhost-supply work again by bringing them in sync again.

This mimics the upstream Linux change found on:
http://lore.kernel.org/r/20200604091239.424318-1-heiko@sntech.de



Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>