dt-bindings: Document optional properties for cluster device

Document optional properties.

Change-Id: If6ad8199f3d6ac7f35bd3550b997e97bd8612799
Signed-off-by: Maulik Shah <quic_mkshah@quicinc.com>

bindings/arm/msm/qcom,lpm-cluster-dev.yaml

@@ -6,6 +6,9 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Qualcomm Technologies, Inc. Low Power Management Cluster Device
 
+maintainers:
+  - Maulik Shah <quic_mkshah@quicinc.com>
+
 description: |
   The application processor can do a variety of cluster level low power modes.
   It does so by predicting the low power mode based on latency and residency
@@ -21,6 +24,21 @@ properties:
   power-domains:
     maxItems: 1
 
+  qcom,pred-prem-cnt:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Number of premature exits cluster device considers for prediction.
+
+  qcom,sample-invalid-time:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Time after which past samples are invalidated.
+
+  qcom,use-cluster-bias-timer:
+    type: boolean
+    description:
+      Used to determine if bias timer to be setup for cluster
+
 required:
   - compatible
   - power-domains