Merge tag 'efi-2024-04-rc1-2' of https://source.denx.de/u-boot/custodians/u-boot-efi

Documentation:

* add generated index to table of contents
* create index entries for commands
* update Python packages used to build the documentation
* fix typos in dfu documentation

UEFI:

* split unrelated code from efi_bootmgr.c
* rename CONFIG_BOOTEFI_BOOTMGR to CONFIG_EFI_BOOTMGR
* net: tftp: remove explicit EFI configuration dependency
* fs: remove explicit EFI configuration dependency

Other:

* Add Goldfish RTC driver and make it available on RISC-V QEMU