arm64: dts: sdm845: Add UFS PHY reset

Wire up the reset controller in the Qcom UFS controller for the PHY.
This will be used to toggle PHY reset during initialization of the PHY.

Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <agross@kernel.org>