Merge tag 'u-boot-imx-master-20240505' of https://gitlab.denx.de/u-boot/custodians...

CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/20614

- Add SPL variant of DM_RNG so that the DM_RNG can be disabled in SPL if
  necessary. This may be necessary due to e.g. size constraints of the SPL.
- dd SPL variant of SPL_FSL_CAAM_RNG so that the SPL_FSL_CAAM_RNG can be
  disabled in SPL if necessary. This may be necessary due to e.g.  size
  constraints of the SPL.
- Differentiate between CAAM and DCP in Kconfig entry.