Cache lines' access timestamp in cleaning policy metadata not being updated

[mmichal10]

ocf_cleaning_set_hot_cache_line() should be called each time a dirty cache line is accessed. Instead it is called only when the cache line is changing it's state from clean to dirty.

How to reproduce:

• Start a cache in WB and configure alru casadm -X -n cleaning-alru -i 1 -w 0 -s 30 -b 100 -t 0
• Issue writes to single cache line fio --name=nvme --numjobs=1 --iodepth=4 --bs=4k --rw=write --ioengine=libaio --direct=1 --group_reporting=1 --filename=/dev/cas1-1 --filesize=4k --runtime=60 --time_based=1
• Dirty block flushes as soon as fio is completed

Expected result:

Dirty block flushed 30 seconds (--staleness-time 30) after fio is completed.