mm/damon/sysfs: use only quota->goals

mm/damon/sysfs: use only quota->goals

DAMON sysfs interface implements multiple quota auto-tuning goals on its
level since the DAMOS core logic was supporting only single goal.  Now the
core logic supports multiple goals on its level.  Update DAMON sysfs
interface to reuse the core logic and drop unnecessary duplicated multiple
goals implementation.

Link: https://lkml.kernel.org/r/20240219194431.159606-10-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>