drm/tilcdc: Move tilcdc_init/fini closer to probe/remove

drm/tilcdc: Move tilcdc_init/fini closer to probe/remove

Move tilcdc_init/fini functions adjacent to the probe and remove functions
in preparation for cleanup and modernization. This improves readability
for subsequent commits that will refactor these functions.

No functional changes, only code reorganization.

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-v5-15-5a44d2aa3f6f@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>