imx8mn: synchronise device tree with linux

arch/arm/dts/imx8mn-beacon-baseboard.dtsi

arch/arm/dts/imx8mn-beacon-som.dtsi

arch/arm/dts/imx8mn-bsh-smm-s2-common.dtsi

arch/arm/dts/imx8mn-bsh-smm-s2pro.dts

arch/arm/dts/imx8mn-ddr4-evk.dts

arch/arm/dts/imx8mn-evk-u-boot.dtsi

arch/arm/dts/imx8mn-evk.dts

arch/arm/dts/imx8mn-evk.dtsi

arch/arm/dts/imx8mn-var-som.dtsi

arch/arm/dts/imx8mn-venice-gw7902.dts

arch/arm/dts/imx8mn.dtsi

board/freescale/imx8mn_evk/spl.c

include/dt-bindings/clock/imx8mn-clock.h

include/dt-bindings/power/imx8mn-power.h

include/dt-bindings/sound/tlv320aic31xx.h