dt-bindings: add MediaTek XS-PHY binding

Add a DT binding documentation of XS-PHY for MediaTek SoCs
with USB3.1 GEN2 controller

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
1 file changed