arm64: dts: imx8mn: specify dma-ranges

DMA addressing capabilities on i.MX8MN are limited by the interconnect,
same as on i.MX8MQ. Add dma-ranges to the the peripheral bus to let
the kernel know about this.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn.dtsi

@@ -245,6 +245,7 @@ soc@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x0 0x0 0x0 0x3e000000>;
+		dma-ranges = <0x40000000 0x0 0x40000000 0xc0000000>;
 		nvmem-cells = <&imx8mn_uid>;
 		nvmem-cell-names = "soc_unique_id";