Replace the unnecessary division calculation with cma->count when update
the value of totalcma_pages.

Link: https://lkml.kernel.org/r/20240729080431.70916-1-hao.ge@linux.devSigned-off-by: Hao Ge <gehao@kylinos.cn>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>