mm/damon/sysfs-schemes: support DAMOS_FILTER_TYPE_AGE_MS

[mm/damon/sysfs-schemes: support DAMOS_FILTER_TYPE_AGE_MS] Support use of DAMOS_FILTER_TYPE_AGE_MS via DAMON sysfs ABI. Add a user keyword “age_ms” for configuring a filter of the type using the exis