Merge tag 'u-boot-imx-master-20231220' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx

- Make DRAM stable on i.MX8MP DHCOM SoM by using FPWM mode and updating
  the DRAM timing
- Fix display artifacts when booting Linux on i.MX8M Mini/Plus eDM SBC