anolis: mm: pagecache_limit: reject reclaim_interval_ms values above UINT_MAX

ANBZ: #54819

The memory.pagecache_limit.reclaim_interval_ms cgroup v1 interface parses its input with kstrtou64() but passes the value directly to msecs_to_jiffies(), whose parameter type is unsigned int. Values above UINT_MAX therefore lose their high bits silently: writing 4294967296 (2^32) succeeds and stores/reads back 0, which disables the reclaim worker’s interval-based re-arming in memcg_pgcache_limit_work_func(), and writing 2^32+1000 is treated as 1000 ms. The saturation guard inside __msecs_to_jiffies() only sees the already-narrowed value and cannot catch this.

Reject inputs above UINT_MAX with -EINVAL in the write callback, so over-range configurations fail loudly instead of silently changing the configured interval. All values within [0, UINT_MAX] keep their exact previous behavior.