dt-bindings: phy-qcom-qmp: Add sm8150 UFS phy compatible string

Document "qcom,sdm845-qmp-ufs-phy" compatible string for QMP UFS PHY
found on SM8150.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>