dt-bindings: clock: mediatek: add MT7988 clock IDs

Add MT7988 clock dt-bindings for topckgen, apmixedsys, infracfg,
ethernet and xfipll subsystem clocks.

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/27f99db432e9ccc804cc5b6501d7d17d72cae879.1702849494.git.daniel@makrotopia.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>