phy: phy-mtk-hdmi: Add generic phy configure callback

Some phys, such as mt8195, needs to have a configure callback defined.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
Link: https://lore.kernel.org/r/20220919-v8-2-a84c80468fe9@baylibre.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>