xf86-video-intel: use uxa to replace sna as the default acceleration mode
The sna mode causes screen distortion issue on board MinnowMAX
described in this link:
https://bugs.freedesktop.org/show_bug.cgi?id=100700
The uxa mode is verified to not have above issue.
uxa is more stable and has more releases than sna.
So use uxa to replace sna as the default acceleration mode.
Signed-off-by: Li Zhou <li.zhou@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
