util/vma: Add a function to allocate a particular address range

util/vma: Add a function to allocate a particular address range

This new function lets you request to remove a specific address range
from the allocator.  It returns true on success and leaves the allocator
unmodified and returns false on failure.  It doesn't need to return an
offset because, if it succeeds, the offset passed in is the allocated
offset.

Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>