mm: migrate_device: use walk_page_range_vma() in migrate_vma_collect()

migrate_vma_collect() uses walk_page_range() to walk the page table. 
Fortunately, migrate_vma_setup() already validates that the entire range
falls within a single VMA.

Since there is no .test_walk in migrate_vma_walk_ops and VM_PFNMAP was
filtered by migrate_vma_setup(), it's safe to replace walk_page_range()
with walk_page_range_vma() to eliminate an unnecessary find_vma() lookup.

Link: https://lore.kernel.org/20260618092845.3905740-5-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: Pedro Falcato <pfalcato@suse.de>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Ying Huang <ying.huang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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