drivers/base/memory: fix stale reference to memory_block_add_nid()

drivers/base/memory: fix stale reference to memory_block_add_nid()

The function memory_block_add_nid() was renamed to
memory_block_add_nid_early() by commit 0a947c14e48c ("drivers/base: move
memory_block_add_nid() into the caller").  Update the stale reference in
add_memory_block().

Assisted-by: unnamed:deepseek-v3.2 coccinelle
Link: https://lkml.kernel.org/r/20260321105704.6093-1-kexinsun@smail.nju.edu.cn
Signed-off-by: Kexin Sun <kexinsun@smail.nju.edu.cn>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed by: Donet Tom <donettom@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>