Fix comment about VADRMPRIMESurfaceDescriptor
Fix comment about VADRMPRIMESurfaceDescriptor

The added function for export is vaExportSurfaceHandle(), not
vaAcquireSurfaceHandle().

Signed-off-by: Haihao Xiang <8d677183e5993577d4fa73a419b76987913292d6@intel.com>

01org/libva-cros,01org/libva-cros,01org/libva-cros