scheduler: Create SDTL_SKIP flag to skip topology level

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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A system admin may not want to use cluster scheduling.  Make changes to
allow cluster topology level to be skipped when building sched domains.

Create SDTL_SKIP bit on the sched_domain_topology_level flag so we can
check if the cluster topology level should be skipped when building
sched domains.

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