display: [REVERTME] keep power island on if hdmi audio is active during suspend

display: [REVERTME] keep power island on if hdmi audio is active during suspend

BZ: 31959

for redridge, during suspend, if hdmi audio is active, and dpms is called for
MIPI, then I2C error will happen when resume. this WORKAROUND keeps all graphic
islands on, and just turn off LVDS panel's backlight if hdmi audio is active.

Change-Id: Id4e44c14d9ef99e10aed68fb97820f08390484b5
Signed-off-by: Geng Xiujun <xiujun.geng@intel.com>
Reviewed-on: http://android.intel.com:8080/46948
Reviewed-by: Zhang, Lei <lei.zhang@intel.com>
Reviewed-by: Ai, Ke <ke.ai@intel.com>
Reviewed-by: Xu, Randy <randy.xu@intel.com>
Tested-by: Tong, BoX <box.tong@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>