Merge tag 'efi-2025-10-rc6' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request efi-2025-10-rc6

CI:

* https://source.denx.de/u-boot/custodians/u-boot-efi/-/pipelines/27745

Docs:

* Correct encodings for spl memory layout diagrams
* Suggest usage of KDOC_WERROR when building documentation
* Replace references to README.fdt-control
* Clarify precedence of environment locations
* Add documentation for the TI am335x_evm board
* Remove README.commands.itest
* Add a note about asking for feedback in the development process

UEFI:

* Cleanup UEFI Variables Kconfig menu