arm64: dts: rockchip: add Innosilicon hdmi phy node to rk3328

The rk3328 uses a hdmiphy from Innosilicon, so add the necessary node
to the rk3328 soc devicetree.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Robin Murphy <robin.murphy@arm.com>