https://github.com/rhinstaller/efivar/releases/tag/26
https://github.com/rhinstaller/efivar/releases/tag/27
Simple bump worked for me to efivar-26, however the 2 patches ("0.21-nvme_ioctl.h.patch" & "0.23-sysmacros.patch") are no-longer needed for this version. To bump 27 instead, you'll need to change the SRC_URI as they haven't (yet?) done a full/proper release.