arm64: dts: mediatek: mt6795: Add Frequency Hopping Controller node

Add FHCTL node but keep it disabled as the PLL clocks that should be
handled through FHCTL and the Spread Spectrum Clocking parameters are
board specific.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230327083647.22017-2-angelogioacchino.delregno@collabora.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>