sched: migtate user interface from smart grid to sched bpf

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I918W0



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Migtating user interface from smart grid to sched bpf, which allows
users to set SCHED_GRID_QOS_TASK_LEVEL through:

	/proc/${pid}/task/${pid}/tag

interface. Although arbitrary integer value could be assigned to
<tag>, currnetly we clamp the value of SCHED_GRID_QOS_TASK_LEVEL
to 0-7, which maintains consistency.

Signed-off-by: Liao Chen <liaochen4@huawei.com>