Merge "bindings: update documentation for custom-bridge-size"

    items:

      - const: qcom,tee-shared-memory-bridge

  qcom,custom-bridge-size : indicates the size of SHM Bridge to be supported in multiples of 4K

required:

  - compatible

optional:

  - qcom,custom-bridge-size

examples:

  - |

    qtee_shmbridge {

        compatible = "qcom,tee-shared-memory-bridge";

    };

    To allocate 1M memory for SHMBridge, we will have entry like this:

    qtee_shmbridge {

	compatible = "qcom,tee-shared-memory-bridge";

	qcom,custom-bridge-size = <256>;

    };