efi-boot-generator patched to use /boot/efi

In PLD we have /boot/efi mount point for the EFI system partitions.
Mounting ESP under /boot (which is default behaviour of systemd if
/boot is empty and system is booted from EFI) may  be problematic, as
ESP contains a FAT file-system and we have RPM packages putting files,
even symlinks, in /boot.

Also, our efi-boot-update expects ESP mounted at /boot/efi.