Merge changes from topic "bk/context_refactor" into integration

* changes:
  refactor(cm): enable S-EL2 globally for all contexts
  refactor(cm): remove world differentiation for EL2 context restore
  fix(cm): make ICC_SRE_EL2 fixup generic to all worlds
  refactor(cm): clean up SCR_EL3 and CPTR_EL3 initialization