tools/mm: move gup_test from selftests/mm to tools/mm

Move tools/testing/selftests/mm/gup_test.c to tools/mm/gup_bench.c.  This
is the first step in separating its benchmarking and functional testing
components.  Later patches will make this a purely benchmarking tool and
introduce a new functional selftest under selftests/mm.

Include hugepage_settings.h directly instead of vm_util.h and use
getpagesize() instead of psize().

Adjust the Makefiles in both locations and add gup_bench to
tools/mm/.gitignore.  Remove the gup_test invocations from run_vmtests.sh
and update MAINTAINERS.

Also remove the gup_test reference from
Documentation/core-api/pin_user_pages.rst.  The selftest added later in
the series is standalone and does not need per command documentation here.

Link: https://lore.kernel.org/20260918112234.195857-5-sarthak.sharma@arm.com
Signed-off-by: Sarthak Sharma <sarthak.sharma@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: David Hildenbrand (Arm) <david@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Tested-by: Muhammad Usama Anjum <usama.anjum@arm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Mark Brown <broonie@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Zi Yan <ziy@nvidia.com>

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