dt-bindings: mailbox: Drop consumers example DTS

Providers DTS examples should not contain consumer nodes, because they
are completely redundant, obvious (defined in common schema) and add
unnecessary bloat. Drop consumer examples and unneeded node labels.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Nishanth Menon <[e-mail]>
Acked-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Jassi Brar <[e-mail]>

Documentation/devicetree/bindings/mailbox/nvidia,tegra186-hsp.yaml

···
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/mailbox/tegra186-hsp.h>
 
-    hsp_top0: mailbox@3c00000 {
+    mailbox@3c00000 {
         compatible = "nvidia,tegra186-hsp";
         reg = <0x03c00000 0xa0000>;
         interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
         interrupt-names = "doorbell";
         #mbox-cells = <2>;
-    };
-
-    client {
-        mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_DB TEGRA_HSP_DB_MASTER_CCPLEX>;
     };

Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml

···
   # Example apcs with msm8996
   - |
     #include <dt-bindings/interrupt-controller/arm-gic.h>
-    apcs_glb: mailbox@9820000 {
+    mailbox@9820000 {
         compatible = "qcom,msm8996-apcs-hmss-global";
         reg = <0x9820000 0x1000>;
 
         #mbox-cells = <1>;
         #clock-cells = <0>;
-    };
-
-    rpm-glink {
-        compatible = "qcom,glink-rpm";
-        interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
-        qcom,rpm-msg-ram = <&rpm_msg_ram>;
-        mboxes = <&apcs_glb 0>;
     };
 
   # Example apcs with qcs404

Documentation/devicetree/bindings/mailbox/ti,omap-mailbox.yaml

···
   - |
     /* OMAP4 */
     #include <dt-bindings/interrupt-controller/arm-gic.h>
-    mailbox: mailbox@4a0f4000 {
+    mailbox@4a0f4000 {
         compatible = "ti,omap4-mailbox";
         reg = <0x4a0f4000 0x200>;
         interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
···
         };
     };
 
-    dsp {
-        mboxes = <&mailbox &mbox_dsp>;
-    };
-
   - |
     /* AM33xx */
-    mailbox1: mailbox@480c8000 {
+    mailbox@480c8000 {
         compatible = "ti,omap4-mailbox";
         reg = <0x480c8000 0x200>;
         interrupts = <77>;
···
 
   - |
     /* AM65x */
-    mailbox0_cluster0: mailbox@31f80000 {
+    mailbox@31f80000 {
         compatible = "ti,am654-mailbox";
         reg = <0x31f80000 0x200>;
         #mbox-cells = <1>;