drm/tilcdc: Use drm_module_platform_driver() helper

drm/tilcdc: Use drm_module_platform_driver() helper

Use the drm_module_platform_driver() helper macro to simplify driver
registration. This macro handles both the platform driver registration
and the drm_firmware_drivers_only() check, making the custom init/exit
functions unnecessary.

Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Kory Maincent (TI.com) <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20260123-feature_tilcdc-v5-14-5a44d2aa3f6f@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>