dt-bindings: phy-qcom-qmp: Add UFS phy compatible string for sdm845

Update the compatible string for UFS QMP PHY on SDM845.

Signed-off-by: Can Guo <cang@codeaurora.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>