Some platforms need additional power domains to be on in addition to the
device D0 state to access the panel registers.

Suggested by Daniel.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76987Signed-off-by: NImre Deak <imre.deak@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>