dt-bindings: phy: tegra20-usb-phy: Document properties needed for OTG mode

In order to support OTG mode we need these new properties:

	- interrupt
	- nvidia,pmc

Add the new properties to the binding.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20210912181718.1328-3-digetx@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>