Merge tag 'efi-2025-10-rc1' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request efi-2025-10-rc1

CI: https://source.denx.de/u-boot/custodians/u-boot-efi/-/pipelines/27176

Documentation:

* update FIT signature testing instructions
* describe defconfigs for AM69-SK

UEFI:

* provide unit test for system table pointer
* efi_realloc() must check efi_alloc() return value
* correct EFI_DEBUG_TABLE_ENTRY_SIZE
* avoid NULL dereference in ESRT creation tests
* add missing check in FMP.GetImageInfo()
* rename lib/efi to lib/efi_client
* rename CONFIG_EFI to CONFIG_EFI_CLIENT
* create a new CONFIG_EFI
* update maintainers for EFI_CLIENT