arm64: dts: mediatek: mt7988: Add t-phy for ssusb1

arm64: dts: mediatek: mt7988: Add t-phy for ssusb1

USB controller needs phys for working properly.
On mt7988 ssusb0 uses a xs-phy, ssusb uses t-phy.
For now add the t-phy for ssusb1. We can reuse the mt7986 compatible
here.

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/20241217091238.16032-10-linux@fw-web.de
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>