memblock tests: remove completed TODO item

Remove completed item from TODO list.

Reviewed-by: David Hildenbrand <[e-mail]>
Signed-off-by: Rebecca Mckeever <[e-mail]>
Signed-off-by: Mike Rapoport <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/testing/memblock/TODO

···
 TODO
 =====
 
-1. Add test cases using this functions (implement them for both directions):
-   + memblock_alloc_raw()
-   + memblock_alloc_exact_nid_raw()
-   + memblock_alloc_try_nid_raw()
-
-2. Add tests for memblock_alloc_node() to check if the correct NUMA node is set
+1. Add tests for memblock_alloc_node() to check if the correct NUMA node is set
    for the new region