arm64: dts: imx8mp: Add Hantro G1, G2 DT nodes

Add DT nodes for the Hantro VPU found in i.MX8MP SoC.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Tested-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>