When we merge PC8 and runtime PM, these new functions are going to be
called by the runtime suspend/resume functions, and their callers are
going to be removed.

v2: - Rebase

Reviewed-by: Imre Deak <imre.deak@intel.com> (v1)
Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>