Abstract out schedulers config data for vCPU threads and other hypervisor
threads to sched_params structure. And it's used to initialize per
thread scheduler private data. The sched_params for vCPU threads come
from vm_config generated by config tools while other hypervisor threads
need give them explicitly.
Tracked-On: #8500
Signed-off-by: Qiang Zhang <qiang4.zhang@intel.com>