CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/23643
- Make DRAM coding GPIOs available before relocation on Data Modul
i.MX8M Mini/Plus eDM SBC because the DRAM configuration GPIO straps
must be accessible in SPL and before relocation because the GPIOs are
sampled both in U-Boot SPL as well as early on in U-Boot proper.
- Pick safe DRAM size on failure on Data Modul i.MX8M Mini/Plus eDM SBC
instead of failing with hang() or panic().
- Replace YModem with SDP on Data Modul i.MX8M Mini eDM SBC SPL since
SDP is much more flexible.
- Deduplicate Data Modul i.MX8M eDM SBC defconfigs.
- Perform plain boot in altbootcmd on Data Modul i.MX8M Mini/Plus eDM
SBC.