drm: Fix the CRTC_STEREO_DOUBLE_ONLY define to include stero modes

drm: Fix the CRTC_STEREO_DOUBLE_ONLY define to include stero modes

The CRTC_STEREO_DOUBLE_ONLY define was introduced in commit:

  commit ecb7e16bf187bc369cf6a5cd108582c01329980d
  Author: Gustavo Padovan <[email protected]>
  Date:   Mon Dec 1 15:40:09 2014 -0800

      drm: add helper to get crtc timings (v5)

but if we want the stereo h/v adjustments, we need to set the
CRTC_STEREO_DOUBLE flag. Otherwise, we'll get the wrong h/v for frame packing
stereo 3d modes.

Cc: Gustavo Padovan <[email protected]>
Cc: Matt Roper <[email protected]>
Cc: Ander Conselvan de Oliveira <[email protected]>
Signed-off-by: Damien Lespiau <[email protected]>
Reviewed-by: Matt Roper <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>