dt-bindings: phy-qcom-qmp: Update bindings for sdm845

Update compatible strings for USB3 PHYs on SDM845.
One is QMPv3 DisplayPort-USB combo PHY and other one
is USB UNI PHY which is single lane USB3 PHY without
DP capability. While at it also remove "qcom,qmp-v3-usb3-phy"
compatible string which was earlier added for sdm845
only as there wouldn't be any user of same.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>