mm/damon: simplify scheme create in lru_sort.c

mm/damon: simplify scheme create in lru_sort.c

In damon_lru_sort_new_hot_scheme() and damon_lru_sort_new_cold_scheme(),
they have so much in common, so we can combine them into a single
function, and we just need to distinguish their differences.

[yangyingliang@huawei.com: change damon_lru_sort_stub_pattern to static]
Link: https://lkml.kernel.org/r/20220917121228.1889699-1-yangyingliang@huawei.com
Link: https://lkml.kernel.org/r/20220915133041.71819-1-sj@kernel.org
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Suggested-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>