efi/bgrt: Accept BGRT tables with a version of 0

Some (somewhat older) laptops have a correct BGRT table, except that the
version field is 0 instead of 1.

This has been seen on several Ivy Bridge based Lenovo models.

For now the spec. only defines version 1, so it is reasonably safe to
assume that tables with a version of 0 really are version 1 too,
which is what this commit does so that the BGRT table will be accepted
by the kernel on laptop models with this issue.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200131130623.33875-1-hdegoede@redhat.com
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>