drm/dp_dual_mode: Pass drm_device to drm_lspcon_(get|set)_mode()

So that we can start using drm_dbg_*() throughout the DRM DP helpers.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210423184309.207645-13-lyude@redhat.com


Reviewed-by: Dave Airlie <airlied@redhat.com>