If we detect a ESP (via its type UUID) remember it and mount it at
any filesystem that has a /boot/efi (there should in theory be
only one). This is needed so grubenv can be read, which is likely
a link from /boot/grub2/grubenv to ../efi/EFI/$vendor/grubenv.
Additionally this will make rpm verify not report that all the efi
binaries are missing, e.g.:
"missing": [
"/boot/efi/EFI",
"/boot/efi/EFI/BOOT",
"/boot/efi/EFI/BOOT/BOOTIA32.EFI",
"/boot/efi/EFI/BOOT/BOOTX64.EFI",
"/boot/efi/EFI/BOOT/fbia32.efi",
"/boot/efi/EFI/BOOT/fbx64.efi",
"/boot/efi/EFI/fedora",
"/boot/efi/EFI/fedora",
...