x86: refactor psr: L3 CAT: implement Domain init/free and schedule flows.

x86: refactor psr: L3 CAT: implement Domain init/free and schedule flows.

This patch implements the Domain init/free and schedule flows.
- When domain init, its psr resource should be allocated.
- When domain free, its psr resource should be freed too.
- When domain is scheduled, its COS ID on the socket should be
  set into ASSOC register to make corresponding COS MSR value
  work.

Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>