ASoC: dt-bindings: move LPASS clocks related bindings out of q6afe

q6afe (Audio Front End) is one of the DSP service that handles both
LPASS (Low Power Audio SubSystem) Audio ports and LPASS clocks.
As LPASS is a hardwware IP and commonly used by Qualcomm Audio DSP.
In order to allow multiple DSP frameworks to use these bindings
its best to move it out from the dsp specific bindings.

For compatibility reasons and not breaking which is already working
we still maintain same compatible string "qcom,q6afe-clocks"

Also as part of this change convert these LPASS clocks related bindings
into yaml format.

Signed-off-by: Srinivas Kandagatla <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/qcom,q6afe.txt

···
 		  from DSP.
 		  example "qcom,q6afe"
 
-= AFE CLOCKSS
-"clocks" subnode of the AFE node. It represents q6afe clocks
-"clocks" node should have following properties.
-- compatible:
-	Usage: required
-	Value type: <stringlist>
-	Definition: must be "qcom,q6afe-clocks"
-
-- #clock-cells:
-	Usage: required
-	Value type: <u32>
-	Definition: Must be 2. Clock Id followed by
-		below valid clock coupling attributes.
-		1 - for no coupled clock
-		2 - for dividend of the coupled clock
-		3 - for divisor of the coupled clock
-		4 - for inverted and no couple clock
-
 = EXAMPLE
 
 apr-service@4 {
 	compatible = "qcom,q6afe";
 	reg = <APR_SVC_AFE>;
-
-	clocks {
-		compatible = "qcom,q6afe-clocks";
-		#clock-cells = <2>;
-	};
 };

Documentation/devicetree/bindings/sound/qcom,q6dsp-lpass-clocks.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/sound/qcom,q6dsp-lpass-clocks.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Qualcomm DSP LPASS Clock Controller binding
+
+maintainers:
+  - Srinivas Kandagatla <[e-mail]>
+
+description: |
+  This binding describes the Qualcomm DSP Clock Controller
+
+properties:
+  compatible:
+    enum:
+      - qcom,q6afe-clocks
+
+  reg:
+    maxItems: 1
+
+  '#clock-cells':
+    const: 2
+    description:
+      Clock Id is followed by clock coupling attributes.
+        1 = for no coupled clock
+        2 = for dividend of the coupled clock
+        3 = for divisor of the coupled clock
+        4 = for inverted and no couple clock
+
+required:
+  - compatible
+  - reg
+  - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/qcom,apr.h>
+    #include <dt-bindings/sound/qcom,q6afe.h>
+    apr {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        apr-service@4 {
+            reg = <APR_SVC_AFE>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+            clock-controller@2 {
+              compatible = "qcom,q6afe-clocks";
+              reg = <2>;
+              #clock-cells = <2>;
+            };
+        };
+      };