dt-bindings: phy: mtk-xs-phy: support type switch by pericfg

Add support for type switch by pericfg register between USB3/PCIe.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250422132438.15735-5-linux@fw-web.de


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