linux-phytec-fsl

drm/panel: ld9040: Add dummy prepare and unprepare routines

This patch adds dummy definition for prepare and unprepare
routines to ld9040 panel driver.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>