phy: mediatek: xsphy: support type switch by pericfg

Patch from Sam Shih <sam.shih@mediatek.com> found in MediaTek SDK
released under GPL.

Get syscon and use it to set the PHY type.
Extend support to PCIe and SGMII mode in addition to USB2 and USB3.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250422132438.15735-7-linux@fw-web.de


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