mm: numa_memblks: introduce numa_add_reserved_memblk

acpi_parse_cfmws() currently adds empty CFMWS ranges to numa_meminfo with
the expectation that numa_cleanup_meminfo moves them to
numa_reserved_meminfo.  There is no need for that indirection when it is
known in advance that these unpopulated ranges are meant for
numa_reserved_meminfo in support of future hotplug / CXL provisioning.

Introduce and use numa_add_reserved_memblk() to add the empty CFMWS ranges
directly.

Link: https://lkml.kernel.org/r/20250508022719.3941335-1-wangyuquan1236@phytium.com.cn
Signed-off-by: Yuquan Wang <wangyuquan1236@phytium.com.cn>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Cc: Bruno Faccini <bfaccini@nvidia.com>
Cc: Chen Baozi <chenbaozi@phytium.com.cn>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Haibo Xu <haibo1.xu@intel.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Joanthan Cameron <Jonathan.Cameron@huawei.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Robert Richter <rrichter@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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