ACPI: NVS: replace __get_free_page() with kmalloc()

suspend_nvs_alloc() allocates shadow pages for saving and restoring
ACPI Non-Volatile Storage regions across suspend/resume.

These buffers can be allocated with kmalloc() as there's nothing special
about them to go directly to the page allocator.

kmalloc() provides a better API that does not require ugly casts and
kfree() does not need to know the size of the freed object.

Performance difference between kmalloc() and __get_free_pages() is not
measurable as both allocators take an object/page from a per-CPU list for
fast path allocations.

For the slow path the performance is anyway determined by the amount of
reclaim involved rather than by what allocator is used.

Replace use of __get_free_page() with kmalloc() and free_page() with
kfree().

Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260630-b4-acpi-v1-1-a9f59c04d221@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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