dts:imx8mm: Derive imx8mm.dtsi from freescale 5.10.52 kernel
The imx8mm.dtsi file was copied from 5.15 kernel, which leads to errors at least for USB device mode configuration. The file is replaced by freescale/imx8mm.dtsi (5.10.52 kernel), the required modfications will be cherry-picked with the following commits.
BCS 746-001112