memblock: Add missing debug code to memblock_add_node()

All other memblock APIs built on top of memblock_add_range() contain
debug code to print their parameters.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/c45e5218b6fcf0e3aeb63d9a9d9792addae0bb7a.1628672041.git.geert+renesas@glider.be