clk: mediatek: add registration function for clock tree types

Add a new enum, field and function for registering clock tree types.
These types will be later used when looking up parent clocks. This
will replace fragile code that depends on lookup up devices by driver
names or ops.

We also need a way to ensure that any parent clock trees are probed
before trying to use a clock tree that depends on them. Since the
devicetree does not provide these relationships and there are only
a small number of clock parent providers (2 or 3 per SoC) vs. a large
number of clock trees that depend on them, it will simpler to just
always probe the parent clock trees on bind rather than trying to
add device info to all of the clocks to describe their parent
relations. For this, a mtk_common_clk_parent_bind() is added that the
drivers will use to set DM_FLAG_PROBE_AFTER_BIND.

Link: https://patch.msgid.link/20260710-mtk-clk-parent-lookup-improvements-v2-2-f3f3a4a28dca@baylibre.com
Signed-off-by: David Lechner <[email protected]>

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