damon/sysfs-schemes.c contains code for handling of online DAMON
parameters update edge cases.  The logics are no more necessary since
damon_commit_ctx() and damon_commit_quota_goals() takes care of the cases.
Remove the unnecessary code.

Link: https://lkml.kernel.org/r/20240618181809.82078-8-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>