dt-bindings: mailbox: qcom-ipcc: add missing properties into example

These missing required properties are needed for
smp2p binding reference checks.

Also includes cosmetic change to the example formatting.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David Heidelberg <david@ixit.cz>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220426101837.16201-2-david@ixit.cz

Documentation/devicetree/bindings/mailbox/qcom-ipcc.yaml

@@ -76,9 +76,14 @@ examples:
 
         smp2p-modem {
                 compatible = "qcom,smp2p";
-                interrupts-extended = <&ipcc_mproc IPCC_CLIENT_MPSS
-                                IPCC_MPROC_SIGNAL_SMP2P IRQ_TYPE_EDGE_RISING>;
-                mboxes = <&ipcc_mproc IPCC_CLIENT_MPSS IPCC_MPROC_SIGNAL_SMP2P>;
+                qcom,smem = <443>, <429>;
+                interrupts-extended = <&ipcc IPCC_CLIENT_LPASS
+                                             IPCC_MPROC_SIGNAL_SMP2P
+                                             IRQ_TYPE_EDGE_RISING>;
+                mboxes = <&ipcc IPCC_CLIENT_LPASS
+                                IPCC_MPROC_SIGNAL_SMP2P>;
 
+                qcom,local-pid = <0>;
+                qcom,remote-pid = <2>;
                 /* Other SMP2P fields */
         };