More EFI fixes for v5.10-rc:

- revert efivarfs kmemleak fix again - it was a false positive;
- make CONFIG_EFI_EARLYCON depend on CONFIG_EFI explicitly so it does not
  pull in other dependencies unnecessarily if CONFIG_EFI is not set
- defer attempts to load SSDT overrides from EFI vars until after the
  efivar layer is up.
-----BEGIN PGP SIGNATURE-----
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=gvBz
-----END PGP SIGNATURE-----