Adding NVRAM entries manually to support secureboot#4

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SoerenBusse wants to merge 2 commits intohn:masterfrom

SoerenBusse:grub-secureboot-fix

Commits on Oct 3, 2019

- Disable bootloader-id and manually adding EFI entries to NVRAM to support secureboot. (Fixes #3)
SoerenBusse
committed
- Boot shimx64.efi to properply support secure boot
SoerenBusse
committed