rgw/rgw_file: Fix the incorrect lru object eviction

rgw/rgw_file: Fix the incorrect lru object eviction

In func lookup_fh, when RGWFileHandle not be found in fh_cache, it
need to recycle an object and create an new RGWFileHandle. When there
are multi threads use lookup_fh to find and create RGWFileHandle concurrently,
it must to make sure evict lru object from the partiton of fh_cache which new
RGWFileHandle will be inserted to.

Fixes: https://tracker.ceph.com/issues/47235
Signed-off-by: luo rixin <luorixin@huawei.com>