dri: fix driver names
What does this MR do and why?
dri: fix driver names
All the driver reports itself with a hyphen here, so they all stopped
loading completely after 50fc7cc290. Check each of them with the latest
kernel sources.
Fixes: 50fc7cc290d ("glx: directly link to gallium")
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>