selftests/damon/access_memory: add repeat mode

selftests/damon/access_memory: add repeat mode

'access_memory' is an artificial memory access generator program that is
used for a few DAMON selftests.  It accesses a given number of regions one
by one only once, and exits.  Depending on systems, the test workload may
exit faster than expected, making the tests unreliable.  For reliable
control of the artificial memory access pattern, add a mode to make it
repeat running.

Link: https://lkml.kernel.org/r/20260117020731.226785-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>