scheduler: Add boot time enabling/disabling of cluster scheduling

kunpeng inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5W44S
CVE: NA

Reference: https://lore.kernel.org/lkml/cover.1638563225.git.tim.c.chen@linux.intel.com/



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Add boot time parameter sched_cluster to enable or disable cluster
scheduling.  Set boot parameter as follow:

	sched_cluster=0 disables cluster scheduling
	sched_cluster=1 enables cluster scheduling

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Jie Liu <liujie375@h-partners.com>