clk: mediatek: probe parent providers on demand

MediaTek clock trees can reference parents provided by a different clock
controller. The provider registry is populated when each controller
probes, so an early consumer can request a parent before its provider has
been registered.

When lookup misses, find the MediaTek clock device whose operations and
clock-tree type match the requested provider, then probe that device.
This removes the probe-order dependency without probing unrelated clock
controllers or treating a driver's bind callback as a type marker.

Co-developed-by: David Lechner <[email protected]>
Signed-off-by: Carlo Caione <[email protected]>
Link: https://patch.msgid.link/20260724-ccaione-upstream-fix-clk-probe-v2-1-ebcef2e94e9d@baylibre.com
Signed-off-by: David Lechner <[email protected]>

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