arm64: dts: qcom: sdm845: Add USB-related nodes

This adds nodes for USB and related PHYs.

Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
[dianders: reworked quite a bit]
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>