omapdss: panel-tpo-td028ec1: Add module alias

Add module alias string to make it working when panel is compiled as module.
Without this change panel module is not probed thus display is not working.

Signed-off-by: Marek Belisko <marek@goldelico.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>