clk: mediatek: add mt7986 clock IDs

Add MT7986 clock dt-bindings, include topckgen, apmixedsys,
infracfg, and ethernet subsystem clocks.

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211217121148.6753-3-sam.shih@mediatek.com
Reviewed-by: Ryder Lee <ryder.lee@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>