bindings: Add device-tree bindings for SEB, RSB and AON rpmsg drivers

Add device-tree bindings documentation describing the properties
for the SEB, RSB and AON rpmsg drivers.

Change-Id: I58a93f363ea24c6c78e2da55a8b2c076eda14bbe

bindings/soc/qcom/qcom,slate_events_bridge.txt

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+* Slate Events Bridge Driver
+
+slate_events_bridge driver provides a set of apis for clients
+to receive events from slate co processor. The events are
+received over Glink.
+
+Required properties:
+- compatible:	      Must be "qcom,slate-events-bridge"
+
+Example:
+	qcom,slate-events-bridge {
+		compatible = "qcom,slate-events-bridge";
+		};
+

bindings/soc/qcom/qcom,slate_events_bridge_rpmsg.txt

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+* Slate Events Bridge RPMSG Driver
+
+slate_events_bridge_rpmsg driver provides functionality
+to send and receive data over Glink from slate co processor.
+
+Required properties:
+- compatible:	      Must be "qcom,slate-events-bridge-rpmsg"
+- qcom,glink-channels	specifies the glink channel name
+- qcom,glinkpkt-edge	specifies the glink edge to match
+
+Optional properties:
+- intents		specifies the size and count of intents to glink
+
+Example:
+	qcom,slate-events-bridge-rpmsg {
+		compatible = "qcom,slate-events-bridge-rpmsg";
+		qcom,glink-channels = "slate_events";
+		qcom,glinkpkt-edge = "slate";
+		intents = <0x200 5>;
+	};

bindings/soc/qcom/qcom,slate_rsb.txt

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+Qualcomm technologies, Inc. slate-rsb
+
+SALTE-RSB : slate-rsb is used to communicate with Slate over Glink
+to configure the RSB eventsslate-rsb send commands over glink to
+send configure, enable/disable RSB to Slate
+
+Required properties:
+- compatible : should be "qcom,slate-rsb"
+
+Example:
+	qcom,slate-rsb {
+		compatible = "qcom,slate-rsb";
+	};
+

bindings/soc/qcom/qcom,slatecom_rpmsg.txt

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+* Slatecom RPMSG Driver
+
+slatecom_rpmsg driver provides functionality
+to send and receive data over Glink from slate co processor.
+
+Required properties:
+- compatible:	      Must be "qcom,slatecom-rpmsg"
+- qcom,glink-channels	specifies the glink channel name
+- qcom,glinkpkt-edge	specifies the glink edge to match
+
+Optional properties:
+- intents		specifies the size and count of intents to glink
+
+Example:
+	qcom,slatecom-rpmsg {
+		compatible = "qcom,slatecom-rpmsg";
+		qcom,glink-channels = "slate_ctrl";
+		qcom,glinkpkt-edge = "slate";
+		intents = <0x200 1>;
+	};

bindings/soc/qcom/qcom,slatersb_rpmsg.txt

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+Qualcomm technologies, Inc. slatersb-rpmsg
+
+SLATERSB-RPMSG : slatersb-rpmsg is used as an interface between SLATE-RSB
+and slate for Glink communication.slate-rsb is used to communicate with
+Slate over Glink to configure the RSB events.
+
+Required properties:
+- compatible : should be "qcom,slatersb-rpmsg"
+- glink-channels : RSB_CTRL
+- glinkpkt-edge : slate
+- intents : <0x200 1>
+
+Example:
+	qcom,slatersb-rpmsg {
+		compatible = "qcom,slatersb-rpmsg";
+		qcom,glink-channels = "RSB_CTRL";
+		qcom,glinkpkt-edge = "slate";
+		intents = <0x200 1>;
+	};