dri: Update region's width/height on every PutSurface

dri: Update region's width/height on every PutSurface

Currently we expect that if a surface changes size, we will be given a
new buffer with a new name. This is not always true as the ddx may try
to keep the same buffer for the client if it is large enough for the new
size. Since we always know the width/height of the buffer, we can pass
that information along every time into the intel_region struct.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
Cc: Dmitry Ermilov <dmitry.ermilov@intel.com>
Reviewed-by: Sean V Kelley <seanvk@posteo.de>
Tested-by: Sean V Kelley <seanvk@posteo.de>