This is a preparation for GRUB 2.12. With GRUB 2.12 EFI stub is the
recommended way to boot x86 (32-bit or 64-bit) kernels with UEFI, and
the old way is only kept as fallback.
In Linux 6.6, we can select DRM_FBDEV_EMULATION without FB, so FB is no
longer needed. And now FRAMEBUFFER_CONSOLE is not enforced (even if FB
is selected), so we need to select it manually.
1. Don't throw unspecified entries too early. Doing so caused various
rendering glitches. And we can now also check if an entry is
selected but it's parent not.
2. "menu"s in Kconfig can also have dependencies...
Some pre-existing .toml data files are found problematic after the
change, fix them and regenerate all rendered -kernel.xml files.
