Merge tag 'u-boot-imx-master-20240219' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx

CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/19683

- Convert msc_sm2s_imx8mp to DM_SERIAL.
- Make Ethernel functional on msc_sm2s_imx8mp.
- General improvements for msc_sm2s_imx8mp.
- Add suport for the Sielaff i.MX6 Solo board.
- Update GE HealthCare maitainers' e-mail addresses.