dm: use time_in_range() and time_after()

To be future-proof and for better readability the time comparisons are modified
to use time_in_range() and time_after() instead of plain, error-prone math.

Signed-off-by: Manuel Schölling <manuel.schoelling@gmx.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --cc drivers/md/dm-cache-target.c
Simple merge

diff --cc drivers/md/dm-log-userspace-base.c
Simple merge

diff --cc drivers/md/dm-thin.c
Simple merge