Merge "dt-bindings: mhi: net_dev: update devicetree doc for supporting rsc device"

	if netdev used as a standalone device. For example, for software IP

	path, chaining should be disabled.

- mhi,rsc-parent

  Usage: required for rsc device

  Value type: <phandle>

  Definition: RSC channel operate together with IP_HW0 device. If it's a rsc

	device, assign phandle of parent device (IP_HW0).

========

Example:

========

	mhi,interface-name = "rmnet_mhi";

	mhi,mru = <0x4000>;

};

mhi_rmnet@1 {

	mhi,chan = "IP_HW0_RSC";

	mhi,rsc-parent = <&mhi_netdev_0>;

	mhi,mru = <0x8000>;

};