ASoC: dt-bindings: pm8916-analog-codec: Fix misleading example

SPMI devices typically have a single address cell and no size cell,
i.e. reg = <0xf000> for the audio codec instead of reg = <0xf000 0x200>.

The example is a bit misleading because it uses the latter. Copying
this into the device tree would be incorrect and was fixed before for
pm8916.dtsi in commit c2f0cbb5 ("arm64: dts: qcom: pm8916: Remove
invalid reg size from wcd_codec").

Make the example more clear by adding the outer "pmic" node which
specifies the same #address/size-cells that would be used in the
real deivce tree.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230718-pm8916-mclk-v1-1-4b4a58b4240a@gerhold.netSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/qcom,pm8916-wcd-analog-codec.yaml

@@ -115,10 +115,17 @@ examples:
   - |
     #include <dt-bindings/clock/qcom,gcc-msm8916.h>
     #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/spmi/spmi.h>
 
-    audio-codec@f000{
+    pmic@1 {
+      compatible = "qcom,pm8916", "qcom,spmi-pmic";
+      reg = <0x1 SPMI_USID>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      audio-codec@f000 {
         compatible = "qcom,pm8916-wcd-analog-codec";
-      reg = <0xf000 0x200>;
+        reg = <0xf000>;
         reg-names = "pmic-codec-core";
         clocks = <&gcc GCC_CODEC_DIGCODEC_CLK>;
         clock-names = "mclk";
@@ -158,3 +165,4 @@ examples:
         vdd-micbias-supply = <&pm8916_l13>;
         #sound-dai-cells = <1>;
       };
+    };