arm64: dts: mediatek: mt7988: add clock controllers

Add bindings of on-SoC clocks.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/r/20240108085228.4727-4-zajec5@gmail.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>