Merge pull request #42046 from CongMinYin/align-entry-bit

librbd/cache/pwl/ssd: make log entry 64 bit and add ssd version control

Reviewed-by: Mykola Golub <mykola.golub@clyso.com>
Reviewed-by: Deepika Upadhyay <dupadhya@redhat.com>

diff --cc src/librbd/cache/pwl/AbstractWriteLog.cc
Simple merge

diff --cc src/librbd/cache/pwl/AbstractWriteLog.h
Simple merge

diff --cc src/librbd/cache/pwl/rwl/WriteLog.cc
Simple merge

diff --cc src/librbd/cache/pwl/ssd/WriteLog.cc
Simple merge