beginning support for having multiple drm connections open

Signed-off-by: Mattias Andrée <maandree@operamail.com>
derp

Signed-off-by: Mattias Andrée <maandree@operamail.com>
make it possible to have many drm connections

Signed-off-by: Mattias Andrée <maandree@operamail.com>
drm: connection to multiple cards concurrently

Signed-off-by: Mattias Andrée <maandree@operamail.com>
connect to multiple connectors concurrently

Signed-off-by: Mattias Andrée <maandree@operamail.com>