bindings: mproc: Add support for glink-slatecom strings

Qualcomm Technologies, Inc GLINK SLATECOM transport (glink_slatecom_xprt) binding

This binding describes the Qualcomm Technologies, Inc glink slatecom transport

driver, a slatecom-spi based communication channel for sending data between the

various subsystems in Qualcomm Technologies, Inc platforms.

- compatible:

	Usage: required

	Value type: <stringlist>

	Definition: must be "qcom,glink-slatecom-xprt"

- label:

	Usage: required

	Value type: <stringlist>

	Definition: must be "slate"

= EXAMPLE

The following example reprsents a glink_slatecom node.

	qcom,glink-slatecom-xprt-slate {

		compatible = "qcom,glink-slatecom-xprt";

		label = "slate";

	};