mm: shmem: drop the unused macro

mm: shmem: drop the unused macro

Patch series "Some trivial cleanups for shmem".

Patch 1 - Patch 5 do some trivial cleanups and refactoring for shmem.
Patch 6 adds myself as shmem reviewer.

This patch (of 6):

Drop the unused 'BLOCKS_PER_PAGE' macro.

Link: https://lkml.kernel.org/r/cover.1738918357.git.baolin.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/69264cee1d938442477e657004e4924f8a5c4dd4.1738918357.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>