[bug #64471] grub efi memory allocation (efi/mm) does not work on every machine

Follow-up Comment #9, bug #64471 (project grub):

I guess we need smi-automatic GRUB_EFI_MAX_USABLE_ADDRESS variable.

If we have enough memory from low memory segment (<4GB), then use it. If we
have no memory and grub about to return out of memory error, instead crashing,
why not to try allocate from upper address region (4GB+) and lets hope for the
best?

Basically we need new allocation algorithm, filter_memory_map should not
filter based on address, and grub_efi_allocate_pages_real should be smart to
allocate from different regions low and high.


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