CHV has a power well for each pipe. Add the code to deal with them.

The Punit in current hardware doesn't seem ready for this yet, so
leave it iffed out.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NImre Deak <imre.deak@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>