drm/panel: Set non-continuous clock flag on supporting panels

The LG LD070WX3-SL01 and Panasonic VVX10F004B00 are DSI support
non-continuous clock mode. Set the MIPI_DSI_CLOCK_NON_CONTINUOUS
to their definition so host drivers become aware of this capability.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>