mm/hugetlb: refactor early boot gigantic hugepage allocation

The early boot gigantic hugepage allocation helpers currently mix
allocation with huge_bootmem_page setup, and leave part of the
initialization flow in architecture code.

Refactor the interface to return the allocated huge page pointer and move
the huge_bootmem_page setup into the generic hugetlb code.  This makes the
architecture-specific paths focus only on finding memory, while the common
code handles node placement and early page metadata setup in one place.

This also lets powerpc benefit from memblock_reserved_mark_noinit(), which
it did not enable before.

In addition, upcoming cross-zone validation for boot-time gigantic hugetlb
reservation is common logic.  With this refactoring, that logic can stay
in the generic code instead of being duplicated in architecture-specific
paths.

Link: https://lore.kernel.org/20260612035903.2468601-14-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Oscar Salvador (SUSE) <osalvador@suse.de>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Frank van der Linden <fvdl@google.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador (SUSE) <osalvador@kernel.org>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Usama Arif <usama.arif@linux.dev>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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