dt-bindings: phy: qcom,qmp-usb3-dp: Add DP phy information

This binding only describes the USB phy inside the USB3 + DP "combo"
phy. Add information for the DP phy and describe the sub-nodes that
represent the DP and USB3 phys that exist inside the combo wrapper.
Remove reg-names from required properties because it isn't required nor
used by the kernel driver.

Signed-off-by: Stephen Boyd <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Cc: Jeykumar Sankaran <[email protected]>
Cc: Chandan Uddaraju <[email protected]>
Cc: Vara Reddy <[email protected]>
Cc: Tanmay Shah <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Manu Gautam <[email protected]>
Cc: Sandeep Maheswaram <[email protected]>
Cc: Douglas Anderson <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Jonathan Marek <[email protected]>
Cc: Dmitry Baryshkov <[email protected]>
Cc: <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Rob Clark <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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