Merge tag 'u-boot-imx-next-20241223' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx into next

CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/23987

- imx8m: Remove global ddrphy_trained_csr as it is a per board
  configuration.
- Add DM_FLAG_ACTIVE_DMA flag for FEC network driver to avoid potential
  kernel crash.
- Miscellaneous improvements for i.MX8M Venice Gateworks platforms.