Now that the arm,scpi binding is converted to YAML format, the following
errors are seen when doing `make DT_CHECKER_FLAGS=-m dt_binding_check`

From schema: Documentation/devicetree/bindings/firmware/arm,scpi.yaml
Documentation/devicetree/bindings/mailbox/arm,mhu.example.dt.yaml:
	scpi@2f000000: $nodename:0: 'scpi' was expected
Documentation/devicetree/bindings/mailbox/arm,mhu.example.dt.yaml:
	scpi@2f000000: reg: [[0, 788529152, 0, 512]] is not of type 'object'
Documentation/devicetree/bindings/mailbox/arm,mhu.example.dt.yaml:
	scpi@2f000000: 'shmem' is a required property

Fix those error following the SCPI bindings.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org
Signed-off-by: Sudeep Holla <redacted>
---
 Documentation/devicetree/bindings/mailbox/arm,mhu.yaml | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mailbox/arm,mhu.yaml b/Documentation/devicetree/bindings/mailbox/arm,mhu.yaml
index d07eb00b97c8..bfdc3e33565e 100644
--- a/Documentation/devicetree/bindings/mailbox/arm,mhu.yaml
+++ b/Documentation/devicetree/bindings/mailbox/arm,mhu.yaml

@@ -126,9 +126,15 @@ additionalProperties: false
             clock-names = "apb_pclk";
         };
 
-        mhu_client_scpi: scpi@2f000000 {
+        scpi {
             compatible = "arm,scpi";
-            reg = <0 0x2f000000 0 0x200>;
             mboxes = <&mhuB 1 4>; /* HP-NonSecure, 5th doorbell */
+            shmem = <&cpu_scp_hpri>; /* HP-NonSecure */
+
+            scpi_devpd: power-domains-0 {
+                compatible = "arm,scpi-power-domains";
+                num-domains = <2>;
+                #power-domain-cells = <1>;
+            };
         };
     };

-- 
2.25.1