drm/tilcdc: Remove component framework support

drm/tilcdc: Remove component framework support

The tilcdc driver previously used the component framework to bind
external encoder subdrivers (specifically the TDA998x HDMI encoder).
With the removal of these subdrivers in previous commits, the component
framework is no longer needed.

This commit removes all component framework infrastructure including:
- Component master operations and bind/unbind callbacks
- The is_componentized flag and conditional code paths
- tilcdc_get_external_components() and tilcdc_add_component_encoder()
- TDA998x-specific panel configuration

The driver now uses a simplified initialization path that directly
attaches external devices via the DRM bridge API, eliminating the
complexity of dual code paths for componentized vs non-componentized
configurations.

This cleanup removes approximately 140 lines of code and makes the
driver initialization flow more straightforward.

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-v5-7-5a44d2aa3f6f@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>