GFX-Display: improve command mode panel FB update

GFX-Display: improve command mode panel FB update

BZ: 34799

for Enzo BZ 609

1. use async flip instead of schedual work queue,
  to avoid the influnce of continully touch and usb
  hotplug
2. enable hw te 61190[3:2], to avoid tearing.
3. wait for dbi fifo , before process new FB flip,
  to reduce CPU loading

Change-Id: Icd43038224d75856cc8e0c58f86cab44f0525933
Signed-off-by: Ke Ai <ke.ai@intel.com>
Signed-off-by: Patel Hitesh <hitesh.k.patel@intel.com>
Reviewed-on: http://android.intel.com:8080/47785
Reviewed-by: Tong, BoX <box.tong@intel.com>
Tested-by: Tong, BoX <box.tong@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>