dt-bindings: mailbox: nvidia,tegra186-hsp: Use generic node name

According to Devicetree specifications, device node names should be
generic, thus Mailbox provider should be called "mailbox", not "hsp".

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

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

···
         <dt-bindings/mailbox/tegra186-hsp.h>
 
 properties:
-  $nodename:
-    pattern: "^hsp@[0-9a-f]+$"
-
   compatible:
     oneOf:
       - enum:
···
     #include <dt-bindings/interrupt-controller/arm-gic.h>
     #include <dt-bindings/mailbox/tegra186-hsp.h>
 
-    hsp_top0: hsp@3c00000 {
+    hsp_top0: mailbox@3c00000 {
         compatible = "nvidia,tegra186-hsp";
         reg = <0x03c00000 0xa0000>;
         interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;