arm64: dts: qcom: msm8996: Use generic QMP driver for UFS

With support for the MSM8996 UFS PHY added to the common QMP driver,
migrate the DTS to use the common QMP binding.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200125001234.435384-1-bjorn.andersson@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>