dt-bindings: phy: qmp: Add support for QMP phy in IPQ8074

IPQ8074 uses QMP PHY controller that provides support to PCIe and
USB. Adding DT binding information for the same.

Reviewed-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>