memblock: drop for_each_free_mem_pfn_range_in_zone_from()

for_each_free_mem_pfn_range_in_zone_from() and its "backend" implementation
__next_mem_pfn_range_in_zone() were only used by deferred initialization of
the memory map.

Remove them as they are not used anymore.

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
3 files changed