soc: mediatek: mtk-mmsys: Rework routes to specify component ID

In preparation for a refactoring of multimedia related MediaTek
drivers, including mmsys, mutex and mediatek-drm, rework all of
the MMSYS routes to specify a hardware component instance number
(or "SubID") alongside the hardware component type.

This also is one step of preparation towards the removal of the
catch-all mtk_ddp_comp_id enumeration and towards the migration
from a predefined-coupling static hardware component IDSubID
mapping (carrying around a very long enumeration and also some
multiple big arrays in mediatek-drm) to a more flexible map of
Component ID (Type) decoupled from Component SubID (HW Instance)
as then, anyway, techniques to handle components are always the
same on a type basis.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

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