1. fix performance issue with latest XServer
   The recent DRI2 has removed the serial number detection for re-creating
   DRI2 buffer, so if a window changes from unflippable to flippable or vice
   versa, the DRI2 will not call CreateBuffer to re-create the back buffer
   if we just increase the serial number, then the fb id is not created
   and swap buffers will always go copy path.
   if re-create fails, the next swap buffers will generate an error

2. fix an EDID issue if the length is greater than 128

3. fix restor the last good mode issue if a problem occurs

Change-Id: I917c3857a88d45cae8357d1b1bcda34dd93597ab