Add a few more labels to device nodes declared in msm8916.dtsi
so that we can set all needed properties using labels in the
board-specific device tree part.

Also rename the "otg" label to "usb" to allow grouping it with
the USB PHY (usb_hs_phy) node when ordering referenced labels
alphabetically.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200720085406.6716-5-stephan@gerhold.netSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>