arm64: dts: qcom: sdm845: Use UFS reset gpio instead of pinctrl

We use a pinctrl "workaround" to toggle the UFS reset line. Now that UFS
controller can issue the reset, just specify the line as a GPIO and let
it be reset that way.

Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>