mm/damon/sysfs: handle commit command using damon_call()

mm/damon/sysfs: handle commit command using damon_call()

DAMON sysfs interface is using damon_callback->after_aggregation hook with
its self-implemented synchronization mechanism for the hook.  It is
inefficient, complicated, and take up to one aggregation interval to
complete, which can be long on some configs.

Use damon_call() instead.  It provides a synchronization mechanism that
built inside DAMON's core layer, so more efficient than DAMON sysfs
interface's own one.  Also it isolates the implementation inside the core
layer, and hence it makes the code easier to maintain.  Finally, it takes
up to one sampling interval, which is much shorter than the aggregation
interval in common setups.

Link: https://lkml.kernel.org/r/20250306175908.66300-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>