i965: Improve debug output in intelTexImage and intelTexSubimage

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
Add support for RGBA8 and RGBX8 textures in intel_texsubimage_tiled_memcpy

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
docs: Import 10.2.4 release notes

And add a news item.