arm64: dts: rockchip: Specify vid supply for the rk3399-orangepi compass (AK09911)

Despite this not being mentioned in the binding documentation, this
generates a log at boot about it being missing.

Signed-off-by: Alexis Ballier <aballier@gentoo.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>