Merge tag 'u-boot-imx-next-20250227' 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/24876

- Convert imx6q-lxr and imxrt1050 to OF_UPSTREAM.
- Fix potential memory leak on ]imx/imx8/imx8m]image.
- Restrict DDR_SI_TEST to only Siemens Capricorn board.
- Fix CONFIG_BOOTCOUNT_ALTBOOTCMD on Data Modul and DH imx8m boards.