tools/mm: use <stdbool.h> in page_owner_sort.c

tools/mm: use <stdbool.h> in page_owner_sort.c

Use standard <stdbool.h> instead of manually defining bool, true and false.

Link: https://lkml.kernel.org/r/20251015093851.109663-1-ye.liu@linux.dev
Signed-off-by: Ye Liu <liuye@kylinos.cn>
Reviewed-by: Dev Jain <dev.jain@arm.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>