Gfx-Display: optimizate hdmi detection and mode setting

Gfx-Display: optimizate hdmi detection and mode setting

BZ: 38339

This patch has following changes:
1. revert commit a315838f5d0be90e0f0abaf6b0f3683d9dc3b96f, as it's unused
currently.
2. using pointer rather than memcpy and memset.
3. trun off some log print.
4. optime mode setting path.

Change-Id: Ice1e9f916828b2446e0b6f2cf5a74402e08a909f
Signed-off-by: Geng Xiujun <xiujun.geng@intel.com>
Reviewed-on: http://android.intel.com:8080/53134
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>