For Bios and EFI compatibility, grub must be installed twice.
This patch adds the bios version when EFI is selected. The GPT EFI block partitioning
already adds the bios partition, but the bootloader only called grub once.
Change-Id: Iee6c8b3b97b3cfff4562bcb30a50800f5ade894a
Closes-Bug: #1889089